I have a autistic 10yo DD and this worries me so much. She's not very gender conforming - likes her hair long, but that's the only stereotypical "feminine" thing about her. Not interested at all in how she looks or what she wears, as long as she's comfortable. Only wears trousers - preferably trackie bottoms - and boots. Doesn't really fit in with anyone, girls or boys. She's a loner, and genuinely enjoys her own company, but has admitted she "would like a friend to talk to."
She's in early puberty and is clearly uncomfortable with how her body is changing - has gone from being completely unbothered by her body to deeply self-conscious of it in a matter of months. I can see it could appeal to her if she was told there was a way to stop all these changes happening.
So far she's been largely protected from trans propaganda by her somewhat old-fashioned (sensible?) primary school, but I worry about what will happen when she attends secondary, as there doesn't seem to be a "non-woke" secondary in the area.
We've talked about these issues, I've explained that the only things that make you a girl or a boy are your genes and genitalia, and that other that you can dress, act and do whatever you like, but it doesn't change your sex. She knows about sexual stereotypes, and that they're a bad thing - to the extent that she gave a boy in her class a real telling off recently for saying that women are kinder and gentler than men - because "that's sexist!"
We tell her every day that we love her and are proud of her just for being exactly who she is, and on the whole she seems very confident and secure in herself. I can only hope that's enough.