Gender is not a scientific thing. It's just categories of masculinity and femininity and into those buckets we arbitrarily place a whole bunch of traits and behaviours and we move them back and forth or take them out, depending on what era of history we're in, which culture, which country, etc. Gender is COMPLETELY invented by people and it varies throughout the world. It's not a static thing or a scientific thing.

This is not opinion. This is fact.