Now, in practice, I work on diversity because I care about basic fairness.Get down from the ivory tower please. Where do you get off saying that he doesn't believe in fairness? In fact, the original commenter could be seen as being more fair by simply stating that gender shouldn't matter.
At the same time, you're looking at one statistic. The race or religion of project contributors could be looked at, but they aren't because IT IS NOT IMPORTANT. Just to counter any downvotes, when I say it isn't important, I mean the gender debate, not women in general. For some reason, this topic has been rehashed so many times on HN and each time someone tries to look at the argument from a gender-less perspective, people like you -- jacobian -- jump out from the bushes to make statements, charging dissenters with misogyny.
Projects can maintain fairness without specifically targeting a demographic, they need only be open to everyone and never turn someone down simply because of an attribute they cannot change [gender, sexual orientation, race, religion, height, etc].