it's a bit of a generalization, but overall I think there may be something of a difference, before this issue cropped up, between a lot of the men and women who have spoken up.
Overall, I think many of the women, people like JKR, were already pervived as staunch progressives, the kind of people who would of course speak up against another public figure who printed or said something homophobic or racist.
So when they didn't toe the line, it was seen as a betrayal, and also a threat.
Some of the men I think that's been less true. Poeple like Douglas Murray already say themselves as conservatves, or as being out of step in some sense with modern liberal progressivism. It would be difficult to make them feel badly for being ejected from the people who think the right things, as they already know those people hate them.
Maybe that's a feature of the fact that women are more likely to be progressives, or they are more likely to try and be agreeable and conciliatory? Whereas most of those men, you know damn well they don't care what they are called or that someone thinks they are mean. Bullies always try and bully those they think might cave.