Personally I think it is oversimplification - the thing is that - yes there is a root cause in biology - but than that root cause is multiplied by social circumstances. If there are few women in tech - then it is costly for employers to adjust to them (stuff like adding women sizes t-shirts) - plus it is also cheaper intellectually for people to judge women stereotypically. Plus there is that thing that if women are more agreeable than man - than people tend to target them more (with stuff like interruptions etc).