WHO and ICD aren't some all-knowing arbiters of truth lol stop it
That being said though, there are many cultures where there are things men do that would be considered feminine and women masculine to us, and vice versa for our culture to theirs. So while there are very clear distinct differences between men and women (with many exceptions and a lot in between, obviously), culture definitely plays a large role in how people behave; it'd be naïve to think otherwise.