@BishopBrennansArse I wanted to answer to you personally why I am now considered "transphobic" by many people. There are issues with self id that others have outlined here, but this is the one thing that, yes, does scare me. Apologies in advance for the massive post!
As you know, I am autistic and my children very likely so too. I understand the feeling of not being "right" for my entire life, of never fitting in, along with having issues with dysphoria when I was younger. I am not at all concerned by regular people who experience sex dysphoria and whose best treatment for that is considered to be medical transition, I have a lot of empathy for that feeling - though my own was more weight-related. However, there are increasing numbers of autistic children (especially girls, which would have been relevant to me as a child and as you know autism in girls is already massively misunderstood) who are not getting any additional mental help, as once they say they are transgender, any other help (to find out if there is an underlying cause for that feeling) is considered conversion therapy. Psychiatrists and other HCPs are scared for their jobs to question around the subject. There are posters here whose children have been denied any help at all for their dysphoria as they do not want to go down the medical transition route.
Anyway, back to the autism... these children who are presenting as transgender appear to have a feeling of their body not being right, of not fitting in socially with their peers and often of liking things stereotypically associated with the opposite sex.
This could so easily have been me as a child, and I am scared for my boys that this is going to affect them. I am scared that schools all over the UK are teaching (courtesy of mermaids, see comments about their CEO upthread) propaganda about people being "born in the wrong body". I am scared that schools in Scotland have already been told to reinforce gender stereotypes in autistic children to help them understand if they are indeed "born in the wrong body", because they like things which are associated with the opposite sex. I am scared that this then leads to drug therapy with chemo medication that is untested long term in children. Which then leads to blocked puberty, of which the mental effects (of not having a physiologically matured brain) are unknown. Just to add in here, I'm sure there are stats which say that without puberty blocking meds, 80% of children grow out of feeling transgender. When they do have the meds, nearly all continue on to cross sex hormones. They have other affects on the body (in females they can cause the womb to atophy and increase risks of certain cancers), and that then leads to essential surgery. Surgery that will sterilise them (which makes me more than a little uneasy, to don my tinfoil hat about autism and eugenics) and leave them dependant on lifelong hormone meds.
It's a cascade of consequences for children who don't understand better, being told their bodies are wrong.