Many posters on this board talk about having different reactions to men than women, how they behave differently when talking to a man than a woman, presence of a man changing the dynamic of a group etc etc.
What makes you think that these reactions are a choice? These reactions are survival mechanisms stemming from a lifetime of social conditioning and, for too many of us, prior sexual assaults.
My reaction to a man is always coloured by the knowledge that he could rape me and leave me pregnant, that he could easily batter me or murder me. I spent the first seven months of this year feeling nauseous if I looked at a good-looking man, because I would remember that there's a one-in-three chance that he thinks that failing to stop when asked isn't rape, and then I would feel sick with fear. (FYI Rape Crisis said I'm not crazy, just experiencing a delayed trauma response to childhood sexual violence.) I object stridently to the transactivist idea that I'm supposed to somehow switch that response off when a man says he is a woman. I object equally stridently to your idea that I should switch that response on when faced with a woman who says she is a man. What about people like Pips Bunce? Am I supposed to be scared of him when he is in a suit and not scared on dress days?
Oh wait, I think I know the answer to this one. I'm supposed to pretend at all times that men don't have built-in rape weapons and that I'm not scared of them, even when I'm so scared that my mouth is dry, I'm sweating, and my IBS is flaring. I'm supposed to pretend to be treating transwomen like women even whilst I appease and defer to them out of fear of typically male violent reprisal. I'm supposed to pretend to treat transmen like men even though they cannot rape me nor leave me pregnant. I'm supposed to pretend to defer to them even though I don't need to. Fuck that noise, it's not going to happen. Human brains don't work like that. Orwell's 1984, book 1 chapter 1, describes the mental effort and hypervigilance required to constantly feign emotions. It's unreasonable to expect this of women and unhealthy for us to attempt it.
Attempting to change reality by fiat, and changing people's outward reactions by fiat and the threat of reprisals, is right into 1984 territory. I'm thinking of the scene in book 2 chapter 9 where, on the sixth day of Hate Week, the official line suddenly changes to say that Oceania is at war with Eastasia and always has been even though in fact Oceania.had been at war with Eurasia up until then. The orator at the rally changes who he's propagandising about mid-sentence upon being passed a note. Everyone has to pretend that nothing has changed even though they all know that in fact it has, for fear of being dragged off to MiniLove and tortured.
"Oceania was at war with Eastasia: Oceania had always been at war with Eastasia. [...] no reference to the war with Eurasia, or the alliance with Eastasia, should remain in existence anywhere."
A transwoman is a woman: a transwoman has always been a woman. [...] no reference to her sex, or her former name, should remain in existence anywhere.
A transman is a man: a transman has always been a man. [...] no reference to his sex, or his former name, should remain in existence anywhere.
1984 was supposed to be a warning, not a manual.