Earlier quoted context omitted.
Maybe it's based on millions of years of biological differences in their capacities and functions (starting from body strength and role in reproduction), plus differences in social roles, of which some of the latter might be arbitrary, but some are necessary adjustments every historical society understood.
I always find it really amusing that the most pro trust the science people who are in total agreement with all the evolution theories are often also the ones who are the first to be in complete denial that us humans might actually share some characteristics with our closest genetic relatives (chimpanzees).
Like with most religions which "the science" very much qualities for at this point, there believers will just pick and choose what to believe and use to get there way.