Nobody can ever account for all unconscious bias. It's the original sin doctrine of the social justice warrior community.
I'm not saying Graham should drop everything until every last bias is gone. I'm saying he shouldn't act as though sexism is a solved problem at YCombinator just because the percentage of female founders is up and it has women as partners.
Edit: He is willing to do more about the problem generally, and I give him credit for that.
I believe the standard request is:
> "If there was just the pro-activity line of attack, if it was like, "OK, yes, women aren't set up to be startup founders at the level we want." What would be lost if Y Combinator was more proactive about it? About lowering standards or something like that? Or recruiting women or something, like any of those options?"