Why do some people think causasion people are "superior" to other races?

I am caucasion and it really annoys me when I get treated badly by a person that has had bad experience with these people who think they are better than everybody else. They tend to generalize me into that catagory because I am caucasion. What else also annoys me is that when I go to fill something out, like for school and they ask for my race, they have all the correct names for all races. Hispanic, African American, Asian, Cambodian, ECT. but for me it's not caucasion it's WHITE. Ha ha, but I bet if they were to put, black, or brown, people would get really hurt. lol It's like so called "white people" come from Europe and even hispanic countries. There are even Arabs that are white, and full blood mexicans with blonde hair and blue eyes. I know the terrible things that the "white man" has done to people in the past but what people don't seem to realize is that ALL races have been enslaved in history. I don't care what race you are nobody is human property. Lots of my ancestors were Italian and Irish, and they got treated just as badly as the Africans when they came to America but not many history cles teach that anymore. They would throw potatoes at the Irish. lol I'm serious. I hate when people also think, "Well white was or is the supierer race so that means we have to treat them badly now to get back at them." I don't care I agree with you we should all have equal rights. I'm glad I'm not one of those people you are talking about, and I'm sorry that you have met people like that. You are right, ignorent and prejudice people can come from any race, and any culture. *Also I would like to add that a long time ago when my dad was in pennsylvania and he was interviewing for a job the guy LITERILY said, "Look we don't hire ****** Irish. (True story)