Yup, that's a problem. Specially because, once the gender ratio gets too skewed towards one side (it is), the Petrie multiplier kicks in; then the sexism targets each woman more and more frequently.
Potential solutions that I see for the problem:
- Perhaps creating a few instances for women? I don't mean instances to talk only about feminism, but for general stuff. With higher standards against harassment.
- Better mod policing against harassment. Collective action, so it's easy to say and hard to do it, I know.