What is the reason?

Judgement has become something that happens in every day life. Many times, people only judge other on appearance, but why? Is there really a reason why people feel the need to express certain hatred/ biases toward people, or is it just standards that have been set by society? I feel that every single person should have a chance to prove to everyone that they are a good or bad person and to show who they really are. People need to realize that the world isn't only beautiful, there are many things that we as people can not and should not change, no matter how much we want to. Cultural differences also cause problems when it comes to judgement, because, what we, as Americans, see as "normal" or "beautiful" could be seen as repulsive in another culture. We all need to stop and think, before we define beauty.