It makes sense that the post on women founders wouldn't be similarly flagged if the difference is related to comfort level.

Comfort comes from trust and exposure, among other things, and I'd say that most white men have more relationships with women than with people of color.

The legacy and history of the feminist struggle and the civil rights struggle, although related, are vastly different. I would be careful equating the two under any circumstances.

I think many of them are. The topic comes up every couple of weeks in various forms. The ones that seem to do well, however, are more specific and link to well written external posts rather than "Hey, how come there are only X women in Y Combinator?" chatter.