What organisations are there to fight misinformation and prejudice against autistic, adhd people etc?

[YourPoisedFinch]

and disabled people in general

NDs are often thought of as scam artists/ mentally deficient

National council for severe autism. Advocate for those with profound needs especially in the US where things are being cut. Really worth looking up.

any in the uk

They do support people in the UK too, I've joined quite a few of their online seminars and they often report/ raise the profile of things in the UK.

Based in the UK:-

Challenging Behaviour Foundation
MENCAP
Mind
BIRD charity

The profound autism alliance but that is US based. Lot's of helpful info etc though so worth a look.