It usually happens on social media, but sometimes IRL as well.
We'll be talking, some man and I. It is (almost*) always a man, and always a white man, and always a straight white man. Not always a conservative man, either. Often enough, this is a progressive man, or at least he calls himself progressive.
We'll disagree about something.
Now according to the rules, you see, the rules of how woman and men discuss things, I am allowed to disagree with him. But I should tinkle with deferential laughter and cringe and duck my head and hedge everything I say with sweet little girl phrases like "don't you think" and "well, maybe" and "I don't know, I just wonder if" and "I'm just a ignorant little nuffin, but don't you think" and essentially make him feel like a big strong man who is graciously allowing me to be in this big boy intellectual conversation at all.
I stopped doing that particular dance when I was about 25, when I became a feminist. Now I just say what I mean, backing up what I mean with facts and evidence, as if I were a human being in the same way he is a human being.
Not all men by any means, but some men* interpret this as an attack.
These men interpret it as an attack on their manhood. "You're not doing your cause any favors by being such a bitch," one of them said.
Or, "It's women like you who cause men to hate feminists," another said.
I've always blogged under delagar, as all y'all know, and for years many people thought "delagar" was a man. Some people still do. Interestingly, I never got (and never get) reactions like this on those occasions.
I didn't used to believe in fragile masculinity. But these guys have been making such a case for it, it's hard to not to these days.
*Some women interpret it as an attack as well. These are women who think any sort of discussion is "arguing." They also think everything is an "opinion." So when someone points out that what they're saying is factually incorrect, well, that's me imposing my "opinion" over their "opinion" which is just rude. How dare I claim that Trump has put children in cages? Their opinion is that he has not! My "opinion" that he has is no more valid than theirs! It's rude to say they're wrong!