Why do people have to stereotype so much? Whatever someone tells you about a certain aspect in a person, you'll believe it and judge anyone else with that aspect the same way, usually about the way they look, or their sexuality.
So it's there so people can feel better about themselves while making the other feel like crap.
The Merits of Stereotypes By: Dr. Sam Vaknin said:"Social Identity Theory" tells us that stereotypical prejudice is a form of compensatory narcissism. The acts of berating, demeaning, denigrating, and debasing others serve to enhance the perpetrators' self-esteem and regulate their labile sense of self-worth. It is vicarious "pride by proxy" - belonging to an "elite" group bestows superiority on all its members. Not surprisingly, education has some positive influence on racist attitudes and political ideology.
So it's there so people can feel better about themselves while making the other feel like crap.