There are two Autistic children in the family.
Thankfully we haven't run into this situation yet, but when I do have to explain that someone they perceive as one sex would prefer a pretense that they are of the other sex, and language must be carefully staged and manipulated to enable this?
One may cope by being avoidant, they tend to shut down and withdraw. The other? The stress of coping with even the mildest misunderstanding in language for our literal girl that you said something that is not actually, factually correct and true, causes meltdowns, stress and anxiety. She cannot lie on demand, she cannot lie to 'be kind', she will not get undressed on demand in front of a child she will straight out say is a boy, this will never work for her. I dread it. And I dread the exclusion and anger and punishment she risks in trying to live in a world as a female who cannot make her first and only priority to enable males in any space she wishes to use. Where is the inclusivity and tolerance and be kind and bending over backwards to protect feelings for her and the many Autistic kids like her?
And that's aside from that every single girl deserves privacy, dignity, autonomy, and not to have to regard herself as a walking therapeutic resource for the master race for the crime of being born with female biology. All of them. Not just the Autistic ones, disabled ones, the ones with faiths and cultures, the ones with trauma and histories of abuse - God knows there are millions of those, but it's not just them. But a bit of reciprocal inclusiveness and some basic bloody capacity for human compassion would be a start.
This is not what we raise daughters for. We cannot order them on one hand 'you must believe that sex does not exist, no one knows what sex anyone else may be' while at the same time having to take them aside and tell them very quietly and in private, 'never, never say out loud that you are a biological female or you want to be homosexual because this will get you into terrible trouble because of hurting the feelings of those born with penises, and yes, you have to SAY that sex isn't a thing but in actual fact darling, you were born without a penis and that means you're a walking therapeutic resource commanded to serve anyone with a penis who claims the magic words to require your service. Pretend. Pretend you can't see. Pretend you don't know. Say the words, yes I know they're lies but say them anyway or you'll get into trouble. And yes I know you really don't want to go to school and undress in front of this person with a penis and it's awful that you have to but his penis gives him a social power over you and mummy may lose her job unless she tells you to shut up and do. And be traumatised quietly. And welcome to the fucking awful shitty burden of being born female in this world.'
A burden incidentally never dumped upon ANY male regardless of the degree of transition. Because it's sex based.