Even if these numbers are accurate, who cares? Get ready for a shock; men and women are different. We think differently, act differently, and like different things. Why is that bad?
There seem to be changes over time that are larger than genetic drift could account for, though. For example, in 1985, about 35% of undergrad CS degrees were awarded to women, while in 2008, it was 18%. What caused the proportion to drop in half over that time period?
Because clearly, we (especially you) are creating a hostile environment for women on Hacker News, by our stubborn refusal to up-vote more cat-related stories.