This is an example I also find helpful when dealing with people who insist that "there are only two genders" ("because science"). Even species is a leaky abstra

This is an example I also find helpful when dealing with people who insist that "there are only two genders" ("because science"). Even species is a leaky abstraction, let alone sex, gender and sexual attraction. You can argue for a strict gender binary normatively (and we can disagree on that), but even if you try to conflate gender and sex it's still scientifically illiterate to insist that there is a strict binary (although for sex at least humans are bimodal). Leaky abstractions can still be useful but you have to be aware that they're just abstractions and still understand that reality is messy and complicated or you'll end up legislating the value pi.