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as evidence, what it _means_ to be a man, woman, etc, differs from society to society. if you ask me to quantify this precisely, i will struggle. but it's plain for all to see.
The idea that gender is a social concept is so blindingly obvious that, like bbeonx I kind of assume that anyone making comments like yours about "common sense" is either blindly parroting talking points without thinking about them, or arguing in bad faith.