[user104658]

Semi-anecdotal but it seems more or less impossible for it to be the case that male and female brains are not in some ways fundamentally different. Take autism as an example. The official stats are that it's at least a 4:1 ratio of males to females who have autism. Anecdotally, my daughter will be starting at specialist school unit within a local primary school and is so far the only girl in her year group (of 6) and will be one of only two girls in the entire unit (of 16).

The differences are too pronounced to be coincidence, basically. The only explanation is that there are some structural and chemical differences between male and female brains that have nothing to do with socialisation.