I think everyone knows at least one person that they hate for no reason.
If asked why you hate them,
You only come up with a half-ass answer but that doesn't change your mind.
What id it's not that person you hate, but rather yourself.
That person simply provides the vector
To get out all the hateful words that the evil voices build up in your head.
The hate comes from a sort of jealousy.
That person is everything that you want to be, but can't.
They are beautiful, popular, intelligent, athletic, skinny, and most of all, loved.
Self-issues aren't truly solved by knocking someone else down a peg or two.