Since some people are unaware of the breadth and depth of JKR's ableism:
In her award winning(!!!) essay, Rowling explained that she believes autistic trans men and boys (like myself) are not mentally competent to consent to our own medical care.
We're easily influenced, you see. Gullible. Liable to be led astray by militant trans activists, social media, and the glamour and popularity that comes with being transgender.
JK Rowling, outspoken feminist and champion for the rights of women, wants to deny medical autonomy to "girls" because she thinks we're overly-emotional, frivolous, and susceptible to peer pressure.
She has spoken directly about her belief that autistic "girls", especially, should not be allowed to transition because we're intellectually incapable of forming, recognising, and articulating our own identities, and especially vulnerable to "social contagion".
But, of course, the law doesn't (shouldn't) discriminate, and if autistic teens and/or adults can't legally consent to treatment of gender dysphoria, we can't legally consent to the treatment of anything. We won't be able to access any treatment or medication without approval from a responsible adult.
The ability of trans kids to consent to their own medical care has already been the subject of a court case (Bell vs Tavistock). It was overturned on appeal, but one of the potential consequences of that specific case was that cis teens could have lost access to hormonal contraception without parental consent.
If Rowling gets what she's said she wants, the knock-on effect may well be that autistic people in the UK lose the ability to live independently.
This is one of the things she's putting her social and financial clout into. Her ongoing activism is a danger to the lives and wellbeing of all trans people and all autistic people in the UK and abroad.