It’s one thing to disagree about sports teams or favorite foods. It’s another thing entirely to disagree about whether a vaccine is safe, whether an election was stolen, or whether climate change is real. That kind of disagreement often feels deeply personal, even threatening. Why? Our research suggests it’s not simply because other people have different beliefs. It’s because we think those beliefs are wrong. As behavioral scientists who study the role of beliefs in politics and everyday life, we wanted to understand why certain disagreements cut so much deeper than others. The answer, we found, has less to do with difference and more to do with perceived error. People are far more disturbed by beliefs they see as based on incorrect information than by beliefs that merely differ from their own. For example, you and your neighbor might disagree about the ideal level of immigration, and that could feel like a normal political disagreement. But if you believe immigrants commit more crime than U.S.-born residents, and your neighbor believes the statistics show the opposite, the conversation stops being about values and becomes a fight over reality and truth. That distinction matters a great deal, because public debate about polarization often starts with a familiar idea: people simply prefer others who think like them. “Birds of a feather flock together,” as the saying goes. Social scientists call this belief homophily, and many researchers have studied how shared beliefs shape friendships, neighborhoods, media habits, and political life. It makes intuitive sense that people surround themselves with like-minded others, live in communities with similar politics, and consume news that fits their existing views. But our research, based on four studies with more than 2,000 U.S. adults, suggests that this story is incomplete. People do not react the same way to all disagreements. They are especially bothered when they are convinced that someone is simply wrong. That’s a crucial nuance, because it changes how we understand polarization, conflict, and even the ways we talk to one another.
In one study, we asked participants to recall a situation in which another person believed one thing and they believed something else. Some participants described a situation involving different beliefs, while others described one involving incorrect beliefs. The difference was striking. One participant recalled a disagreement about whether couples should live together before marriage, and described it as a difference in priorities rather than a dispute over reality. Another participant recalled arguing with a friend who believed that drinking soda and eating fast food was harmless—a belief the participant considered factually wrong, not just different. The emotional reactions were dramatically different. Participants who saw the other person’s belief as incorrect reported feeling more disturbed, frustrated, and upset than those who simply saw the other person’s belief as different. We found similar patterns in another study where participants first reported their own views on divisive topics such as climate change, capital punishment, and policing. Then they saw a hypothetical social media post that opposed their view. The more confident participants were that the post’s author was factually incorrect, the more disturbed they felt. They also said they would be more likely to avoid, distrust, or block that person. Interestingly, being confident that the author’s belief was simply different—not wrong—did not predict avoidance. To confirm this effect, we gave participants short fictional stories, such as one about a neighbor who believed that a politician was corrupt. All participants read the same basic facts, but we changed only one thing: how we framed the neighbor’s belief. We told some participants the neighbor had different beliefs about the politician’s alleged corruption, and others that the neighbor had incorrect beliefs. Even though the underlying information was identical, people were substantially more disturbed when the other person’s belief was framed as incorrect. This tells us that the perception of wrongness itself, not the content of the disagreement, is what drives much of the emotional heat.
Why do false beliefs make people so frustrated? Our studies point to several possible reasons, and understanding them can help us understand ourselves. The first is consequences. False beliefs often lead to bad decisions. If someone believes vaccines are dangerous, they might not vaccinate their children, which can affect not only them but also the people around them. If someone believes climate change is a hoax, they might oppose policies that could protect the environment. Incorrect beliefs can have ripple effects that feel dangerous and real. So when we encounter someone who seems to be living in a false reality, we may feel genuinely threatened because their mistakes could hurt us, our loved ones, or society as a whole. A second possibility is that false beliefs threaten our sense of shared reality. Human beings rely on other people to make sense of the world. We need to feel that we are not alone in seeing things as they are. When someone appears to deny what feels obvious and true, the conflict can feel far more disturbing than a simple difference in perspective. It’s unsettling to realize that someone else is looking at the same world and seeing something completely different. A third possibility is that people treat false beliefs as signals about the character of the person holding them. When we are convinced that someone is wrong, we often conclude that they must be biased, irrational, or self-interested. Psychologists describe this as naive realism—the belief that we see the world objectively, while those who disagree with us are distorted by bias or self-interest. This kind of judgment makes a false belief feel socially threatening. We are not just saying, “You have incorrect facts.” We are saying, “There is something wrong with you.” That is why disagreements about vaccines, climate change, or election integrity can feel so personal. The conflict is not about information. It becomes a conflict about trust, competence, and moral character.
That said, our findings do not mean that people are indifferent to differences. Differences still matter, especially in close relationships. In our social media study, participants were less able to imagine having close relationships—like family or romantic relationships—with someone whose beliefs differed from theirs, even if they did not consider those beliefs to be false. Shared beliefs and values seem to matter more when people think about spouses, relatives, or close friends than when they think about neighbors, colleagues, or strangers online. But for less intimate relationships, the perception of wrongness was the key predictor of negative feelings and avoidance. People did not necessarily want to avoid those who disagreed with them; they wanted to avoid those they believed were mistaken. This distinction helps explain why some debates become so emotionally intense, especially online. A disagreement about taste in music or sports may stay harmless, but a disagreement about vaccines, climate change, or election integrity can feel completely different because people often see one side as factually wrong and potentially harmful. This also helps explain why social media can be such a hostile place. When we scroll through a post that contradicts our own views, it is easy to label the other person as ignorant or misinformed. The anonymity and distance of the internet makes it even easier to feel that we are dealing with someone who is not just different, but dangerously wrong. That feeling can lead to blocking, unfriending, and the kind of echo chambers that deepen polarization.
There is a paradox in all of this. Public discussions often call for more fact-based debate. People say that we should stick to the evidence, rely on data, and let science guide us. We agree that facts matter, and empirical evidence should absolutely inform public policy and personal decisions. But our research suggests that an aggressive drive to frame everything in terms of hard truths may actually be counterproductive. When people use facts to defend their preferences, tastes, or values, they may turn a disagreement over priorities into a dispute over who is right and who is wrong. That shift can make disagreement much harder to tolerate. It is easy to say, “We should agree to disagree about which school policy reflects the right priorities,” or “We can have different views about which candidate best represents our values.” It is much harder to agree to disagree when facts are at issue, because facts are supposed to be true for everyone. The nastiness of intellectual disputes therefore depends in part on how people frame their positions. Even when the contents of the disagreement are exactly the same, there is a profound difference between saying “we disagree” and saying “you are wrong.” The first invites conversation. The second invites conflict. This is not to say that we should pretend all beliefs are equally valid. Some beliefs genuinely are based on misinformation, and we should not shy away from correcting dangerous falsehoods. But the way we correct others matters. If we approach every disagreement as a battle between truth and falsehood, we may inadvertently make the conflict worse, because we are attacking not just the other person’s ideas but their very capacity to perceive reality.
So what does this mean for how we live together in a polarized world? For one thing, it means we should be more aware of our own reactions. When we feel angry or upset during a political conversation, it may be because we are not just disagreeing with someone—we are judging them as deluded. That judgment feels natural, but it also fuels the intensity of the conflict. If we can recognize that feeling in ourselves, we might create a little more space for curiosity and humility. Instead of saying, “You are wrong,” we could say, “I see it differently,” or “We are starting from very different sources of information.” That small change in language might not solve every disagreement, but it can lower the emotional stakes. It can also help people stop seeing one another as enemies and start seeing each other as fellow human beings who are trying, perhaps imperfectly, to make sense of a complicated world. We also need to remember that many conflicts are not purely about facts. They are about values, identities, and life experiences. When we reduce those conflicts to questions of truth, we lose something important. We lose the ability to coexist with people who are different from us. Our research suggests that the perception of wrongness is a powerful trigger for division. But that perception is not fixed. We can choose how to frame our own beliefs and how to respond to the beliefs of others. We can acknowledge that reality is complex, that information is incomplete, and that good people can come to different conclusions. That does not mean abandoning truth or accepting anything. It means being honest about the difference between saying “we disagree” and saying “you are wrong.” Because in the end, the health of our relationships, our communities, and our democracy may depend less on who is right and more on how we manage the difficult, uncomfortable, and deeply human experience of being different from one another.