[thomasguide]

This comment does not show a lot of curiosity - even a quick read of the Wikipedia article for gender identity refutes this argument. Gender has been differentially and socially constructed throughout human history.[1]

[1] https://en.wikipedia.org/wiki/Gender_identity?wprov=sfti1

[ceejayoz]

https://en.wikipedia.org/wiki/Third_gender is also a good read for historical examples; hints as far back as ancient Mesopotamia.