I think in some ways diversity in tech is very bad (e.g. very many, or perhaps nearly all, of the CEOs of 'unicorns' are white men).
I think YC has made good but not great progress here. I don't pretend to know all the answers. About 11% of the founders that apply to YC are women, and I've heard that's a fair bit higher than what other investors see.
We fund women (and Black and Latino founders) at very nearly the rate they apply. In addition to a pipeline problem, I think there are further problems once women and underrepresented minorities start companies that make it unwelcoming.
I also think the conversation has become so polarized by the extremes on both sides that I feel uneasy participating, and I know other people feel the same way. But I'll certainly keep doing whatever I can do to get YC to help.
We're always open to advice about what to do here.