Liberals usually do get upset about that. But this is the core reason liberal feminism is flawed: They want equal status/outcomes for men and women, not equal opportunity. They assume (incorrectly) that men and women would make the same choices if given equal opportunity, and when unequal outcomes occur, they conclude (incorrectly) that there must be discrimination. Of course, this is not true. In actuality, when given total freedom (equality of opportunity), men and women make different choices...because they are statistically different, and statistically like different things (like sports/not-sports). They've done studies on this. Women shy away from certain sciences or careers and towards others (when given freedom / equality of opportunity); so do men. It is the freedom of choice which causes unequal distribution such as fewer electrical engineer women, not systemic discrimination within the field of electrical engineering.
Maybe women don't like the type of speech which occurs here, as Lehigh suggested. I actually don't think that is a sexist statement. I was basically making the same observation you were making. But he pushed the discussion into "sexism," and I don't think that was a helpful or accurate direction for the discussion to move...at least, not with my post or your post as the starting point.