[socialismisok]

Social sciences aim to be descriptive, reflecting the understanding of cultures.

But also, gender is beyond just US liberal and conservative. Plenty of cultures around the world and throughout recorded history have had third genders and trans people, and they were not considered "weird". I believe sociologists are attempting to review human behavior across all spans and across cultures and compare even to animals (there are recorded instances of animals fulfilling reversed gender roles for their species).