[SamoyedFurFluff]

I think you’ve misinterpreted the common meme. The common meme is that gender or race are social constructs. I haven’t heard the meme sex is a social construct.

[funcDropShadow]

Just my last encounter with the so called meme, that sex is a social construct: [1]. It was just 12 hours ago.

[1]: https://twitter.com/x_mass/status/1488329923471319043

[BeetleB]

Sex has multiple meanings, one of which is gender. I don't know if it's an American vs British English thing, but in many countries they use the word "sex" this way much more frequently than "gender".