if you're wondering why few people agree with your conclusion, that putting gender over sex is sexism
— Mijin

I think it is the case that massive numbers of people agree with this sentiment. You may just have a bubble into which outside voices are refused entry. Most do. Those of us who actively go out of their way to avoid this understand that its basically 50/50 on these types of claims. — AmadeusD

I don't think massive numbers of people agree with the specific claim of this thread, but go ahead and cite me wrong: I'm happy to hear it.

If you instead simply mean that lots of people are anti-trans: sure. It's been whipped up as the moral panic of the day. You talk about living in a bubble: well, the vast majority of people who have strong anti-trans views have never spoken to one, maybe not encountered one.
They've been force-fed that this is the prime issue to care about, and it works because it's easy to sell the idea that something that makes a person uncomfortable must therefore be immoral.

Here in the UK, so many people will ignore the damage that brexit did to the country, the grift and russian-backed treason of the Reform party (our equivalent of maga), because "the Left think men are women", or whatever version of the talking point.