"White people invented the two genders."
It has got to be one of the most racist, sexist, historically-illiterate arguments I have ever come across.
The idea that other races and cultures did not distinguish between male and female before the White Man arrived is ludicrous. What, did everyone in other societies sit in a circle and flip a coin to decide which people would get pregnant? Or were they utterly baffled as to which people had periods and got pregnant until the White Man arrived and explained biology to them?
Anyone who propagates this idea is either very very dim or very very racist. Perhaps both.