Hugely disagree with this.
Behaviours that exist because of a disability absolutely are "excused" by that disability. Excuse is an awful word. Explain is more accurate.
People say it all the time.
Autism is no excuse for autistic behaviours
adhd is no excuse for ADHD symptoms.
You've just got to learn that your autism / ADHD is simply not acceptable. Stop displaying behaviours that are wholly caused by your disability. You're bothering other people with the presentation of your disability.
My sister is blind. If I was to say to her look, you're blind but that's no excuse for not being able to see. You're just going to need to learn to see anyway. Your blindness affects me. It's a pain in the arse to have to move shit out of your way. I'm sick of making sure everything is in the same place so you can get stuff. Last week you stood on my toe and it hurt. It's your responsibility to make sure your disability does not affect others.
Would that be ok? Would I be reasonable to say that to her? Would people be saying yeah, you're right, she needs to learn to not let her blindness impact others or put them in a situation where they need to make, oh, let's call it... reasonable adjustments.
I mean, it would be nuts of me to say that to her, right?
It's never ok to have the attitude that symptoms of a disability are unacceptable and the person with that disability must stop the behaviours that exist only because they have that disability.
I don't care that you're disabled when it affects me, so stop it.
Not ok imo.