At any given moment there is an orthodoxy, a body of ideas which it is assumed that all right-thinking people will accept without question. It is not exactly forbidden to say this, that or the other, but it is ‘not done’ to say it, just as in mid-Victorian times it was ‘not done’ to mention trousers in the presence of a lady.

And here is Musa al-Gharbi riffing on Orwell in his excellent We Have Never Been Woke:

The behaviours of those who profess that ‘trans women are women’ suggest strongly that most do not literally believe that trans women are the same as cisgender women. Proponents who are romantically interested in women typically do not treat these two populations equally as women with respect to their own dating and marriage decisions - not even remotely. Yet these same people, who overwhelmingly fail to behave as though trans and cisgender are equivalent or indistinguishable (that is, who implicitly disagree with the idea that ‘trans women are women’), may nevertheless pillory others who explicitly disagree with the proposition that there is no meaningful difference.