You've said it yourself, I'm pretty sure- women have a bias towards women, and men also have a bias towards women. Have a male and female actor take turns pretending to be a couple and beat each other up, and men will rush to the defense of the woman when it looks like she's being hit, but will ignore it when it's the man who's being hit (The women will largely not take much actual action in either case because they know men will do it for them, but they do tend to openly laugh at the man being hit, and wonder aloud what he did to deserve it, which they obviously don't do for the woman). Or look at men caring about female genital mutilation happening to women on the other side of the planet more than they care about the same thing happening to their own sons. Or the reaction to men attending college more than women decades ago, vs. women attending college more than men now- the first is a tragedy, the second is a cause for celebration. Or how awful it would be to force a woman who doesn't want to be a parent be a parent anyway, when that happens to men every day. It's all the same thing: Most men just care more about women than they do about men. There's an empathy gap. Democrats are able to openly be female supremacists not just because it's what almost all women want, but because it's also what most men want.