There can be a number of reasons why some people think they are better than other people. It could be that they feel more entitled or superior to others, which can lead to them feeling a sense of entitlement and superiority. It could also be that they have been taught to believe this, either by their family or friends, or through their upbringing. Similarly, it could be that they see themselves as experts in certain areas, and so they assume that everyone else is not as good at those same things. Finally, it could simply be that they view themselves as exceptional individuals and so they assume that everyone else does too.