Aside for the obvious, that an 18 year old is an adult and can consent, there is certainly something very ableist here. The idea that someone who has some kind of disorder is incapable of consenting is inherently infantilising and thus dehumanising.
This reminds me of an artist who got into a bit of controversy for taking a commission from someone with ADHD who was 18. People who already didn't like that artist tried to claim that this was bad, some kind of grooming, and that a person with ADHD cannot consent.
Naturally the 18 year old in
question pushed back against this on that occasion.
Anyways, I wish you the best Lore. It can't be easy for you. If you ever need to talk to someone, I'm here for you okay