Still the problem here is we don't _really_ know whether this is genetic or shaped by our upbringing even when it comes to the most egalitarian societies. I'd like to see the same study done on the little left hunter-gatherers bands.
It's funny that you write this comment in this specific thread, because as far as I know, it's literally the only gender difference we've observed truly since birth. (Besides some physical ones like which reproductive organs are in place, obviously.)