The argument that I usually have, and constantly resist, is that a) generally women just aren't as interested in CS as men, and b) that's ok, so c) why give out scholarships to make CS artificially attractive, and d) if the industry isn't suffering for the lack (arguable) what's the big deal?

But I think that the people in CS are being degraded. The women have to deal with a constant stream of rubbish, and men are being conditioned to provide it. It appears that some people are not being given full credit for their skills and work, and in an industry powered by kudos as much as money that should offend everyone.