Where I went to school for the time I was in school there were some poor jews that would kick your ass in a flash if you stepped to them wrong. They were interchangeable with street guineas <italians> I can say that im one.
It all depends on where your from how your outlook is. If you grow up in a place where everyone your around from day one is the same, you are going to have some predisposed perceptions about people you have never been around that are different than you.