I cannot imagine why a woman would ever call herself anything but a feminist. But a man calling himself a feminist, what does that mean? The answer is he wants to be taken as a good guy. Your choice is between saying you're a feminist and raising a flag at a "Take Back the Night" rally and being a men's rights activist, which is basically the only two ways men have of talking about gender right now, I mean that's just ridiculous. That's just two extremes that are totally useless.
