Why do some people dislike Jews?

People are very miserable and need to target groups of individuals in order to feel better about themselves. That's the only reason I can think of. It boggles my mind as well. I live in Orlando and it's very cool because we have a melting pot of religions and races here. At my college, I'm friends with whites, blacks, asians, hatians, hispanics, agnostics, christians, muslims, 2 buddhist guys (yes, 2 that I know of lol), atheists, mexicans (yes I am mixing up my list full of religions and races and I know they're 2 different subjects, but I'm showing you how diverse it is here). It's wonderful to have such diversity here. Therefore, I don't understand how anyone can HATE millions of people for no reason. I am very grateful my parents moved us out of an "all white" pennsylvania suburb to Orlando where I get to be friends with people of all cultures.