I think everyone hates me because I'm not a feminist
What gives you the impression that everyone hates you because you're not a feminist?
Because I make fun of girls who call themselves a feminist for no reason
You may have given people cause not to like you for making fun of feminists, but you should never jump to conclusions about what other people think. Jumping to conclusions lead you to make wrong decisions.
I don't care. Only people who are stupid think they are not sexist but everyone else is.
It sounds like you don't have the best understanding of feminism and may be attributing ideas to people who don't actually have them. Feminists don't assume that everyone is sexist, besides them. They understand how their own behavior perpetuates certain harmful power dynamics as well.