Answer:
I don't "hate" any person that I know in real life. There's definitely people I know in real life who I dislike, but I don't really hate them. However, there are definitely celebrities and historical figures who I hate. I hate Hitler and Stalin, because they were responsible for the deaths of millions of innocent people.
edit: Well, on second thought, I also hate John Mayer. He's super annoying and his music sucks. He's very pretentious.