But we don't teach every crackpot theory starting with "...some people believe". You'd be there all day.
Especially as it's actually being promoted by men with a fetish.
I'd be happy for it to be taught as a sexist, dangerous ideology that has infiltrated schools, the government, the NHS and the police. That it's completely unevidenced, and many proponents of it are either hellbent on accessing women's spaces, or have a sexual fetish.
Sure.
But as an idea that we all have a gender identity? you can't even teach it in theory, because it falls apart three sentences in.
You'd have to get rid of non-binary for a start.
What's the bloody point in teaching an ideology that relies on something being both innate, and something you could acquire in middle age, but also changes from day to day??
You might as well teach wizardry.