There certainly are men out there who hate women, but it doesn't seem to me to be very many. Try it, enumerate the men you know and ask yourself, or even ask them directly, if they love the women in their lives. What fraction of women haters do you find? I think you'll find it's very low. And that's my point, that we are not actually facing an epidemic of misogyny ("hatred of women"), that it is actually something else, or at least much more complicated.

Personally I don't find it hard to come up with another explanation: miserable people want other people to be miserable too. And to make people miserable, you do whatever will be effective. Over the internet, mean words work a lot better against women than against men.