Some were true, but most were BS. I have a psychology book that would say otherwise to a lot of the things. Specifically, women in english. It'll talk about how males tend to score higher mathematically, but women scored higher in things like english and language skills.
Either way, whatever. It doesn't really matter.
I remember an anime where the female to male population ratio was something like 9:1 because males were being exterminated. They did it because throughout history, it was men who caused war and whatnot.
But, MEH. I don't think you guys should really have busted on the dude for it.