The only thing that ever made me question whether I could be a feminist was the mistaken idea that we live in a world built by men and for men, this is simply not true.
The desire to create a better world is never wrong, but the end doesn't justify the means. We can't create a better world based on a lie, while there may be some truth to feminism its fudamental couldn't be farther from the truth and I think that's why a lot of feminists end up acting in opposition to their teachings.
They don't want a better world for men because to them men are already fine, they have all this privilege, and it's women that need help reaching their level. This is why many feminists waste their days checking out guys to see what they can complain about not having because of their sex, spend their days looking for differences, but only when the differences validate the belief that men are better off.
Thinking men are better off just causes resentment, that's why the language often becomes hateful, and that's why most of the world believes feminists hate men.
RE: Be feminist is painful!