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I think you need to read their comment again - they are clearly talking about sex and gender as two different concepts.
sorry, is this in response to my post? in which case, this is exactly the distinction i'm making. the entire argument is whether or not there _is_ a distinction; my point is that this guy just, a priori, decides gender doesn't exist. but there is plenty of evidence that it does. there are plenty of social traits associated with sex that differ across different cultures: pink used to be a manly color, now it's a feminine color; "be a man" doesn't literally mean "make sure your sex is male"; etc. there are traits that are heavily correlated with a person's sex that are culturally reinforced, and this is distinct from their sex.
This is a motte and bailey though. A regular person on the street has never seen a distinction between these two words, and common sense prevailed after years of Silicon Valley policing of speech to try to make an unpopular position seem tenable and widely agreed upon to get the average person to step in line.
What you're describing about gender is.... not really scientific. It was basically declared by fiat by researchers. It's not an authoritative definition and many people disagree with the concept, at least when it gets conflated with scientific topics.