Not Aristotle's brightest moment then!
If anything, XY is the aberration - although not really either. But without women there would be no birth, no reproduction, because men cannot carry a foetus. But there would be no conception without men either, so it's balanced.
So hardly an aberration.
The old Adam and Eve bunkum was just to keep women in second place.
However, men ARE seen as the default because they have never been discommoded by period cramps, being pregnant, giving birth or having to carry a breastfeeding baby around. That's the WOMAN's role. Men just keep on doing what they do regardless until they get hurt.
So much for progressive thinking. 
This is a really interesting thread - especially the indications that the peer pot situation (I won't say pressure as such, just a "group dynamic" thing) is heavily involved in SOME kids' feelings that they might be trans.
I also object violently to the schools going behind that parents' backs - outrageous behaviour, and yes, WHERE is the safeguarding in all of this?
As for the clinicians involved, WHERE is the medical first principle of "First do no harm"?
The Tavistock clinic did conduct a review, apparently, but it was an internal review and found nothing wrong. Several clinicians left before the review, and more after, as they felt that the ethos of the clinic was definitely more about pushing the transition, and less about helping the kids work out if they were genuinely suffering from gender dysphoria, of something else was at play.
This post is a terrible mishmash of thoughts but anyway - I have a young relative who is autistic. She believes implicitly what she is taught by a teacher. Here in Australia, we don't have religious education in schools, it's proscribed - BUT there is the option of having any religious entity come into the school to teach "scripture", and the schools are not allowed to refuse - they must allocate a segment in the week for these classes. They are not taught by teachers but by religious volunteers, and what is taught is not overseen by the Education Dept here. My young relative went to scripture classes (default situation - you have to opt out of them) and immediately absorbed the lesson that "If you were bad you went to HELL!" which she played out with her dolls and had nightmares about. She is that suggestible. I'm sure she's not the only autistic child to be that way, or even the only child to be that way. I'm equally sure that Not All Autistic Children Are Like That - but her autism certainly plays a big part in her vulnerability to taking ideas on board.
If she were to come up against someone who told her she was trans, she would accept that and become trans - she would be one of the ROGD girls. She's right in the "danger zone" age now - and I really hope she gets through it safely.