When I saw the thread title, I thought the post was going to be about JKR saying something excessively harsh about trans people or a trans person -- the social media war on this issue is so intense and exhausting, especially for very high-profile people, that we can sometimes be driven towards a cruel caricature of our own position.
I was relieved and pleased to see that she had, in some people's view, erred in the opposite direction. It was a warm post and I hope that it can be part of a general warming as society starts to resile from the strange orthodoxy that trans women are women.
I'm sure that it used to be the case that calling a trans woman in your circle 'she' wasn't at all constructed as a belief that they were actually women, and wasn't policed as such. It was just a kind of in-group convention, part of the mores of a group.
Partly, it was one of the ways that a group positioned its shared attitudes, like wearing black clothes if you were a goth.
And partly, depending on the individuals concerned, it was done to avoid causing gratuitous upset to an individual. In that context (unlike the current context), 'being kind' was natural and harmless.
Obviously, activism began to exploit that kindness, spinning it into an obligation to believe falsehoods and to translate the mores of specific social circles into a universal policy obligation, binding on all individuals and organisations in every context.
And obviously, in that abusive situation we needed to withdraw from the polite pretences that were used to trap us.
But, in private circles and for individuals who are not compelling us, I would hope that, as the trans mania dies down, it will be, again, increasingly uncontroversial for some women to use 'she' for some men in some social contexts if they choose to do so.
Thinking of the 'pronouns are rohypnol' mantra, if you are in a bar where men abuse women by spiking their drinks, then you do everything you can to avoid accepting a possibly spiked drink. But that doesn't mean that, always and everywhere, you adopt the same level of mistrust. There is still the possibility of accepting a drink from a man that you know well, in a gathering of your friends.