Again, according to the employment lawyer I linked, he was fired for the contents of his writing, not some projection of his mental state.
What I'm trying to point out is that people on the receiving end of discrimination in our industry have recognized patterns of behavior that mostly pass beneath my (and perhaps, your) radar. But they are patterns that women across the board, in different companies, in different fields, recognize and can name to one another. This is what structural sexism means, these patterns are built into our society, today. And this manifesto matched perfectly with a number of negative patterns, hence the strong negative response.
(also, writing is inherently a projection of internal psychological state so I'm not sure I really understand the problem you are talking about)
That I can choose to have a coworker fired over my projection, from his writing, of his internal psychological state is new to me.
The race to be the biggest victim makes sense to me now. That's awesome power.