Ask Lemmygrad

This explains physically disabled treatment in china. https://www.prisoncensorship.info/archive/etext/classics/lifeundermao/deaf1.pdf https://en.m.wikipedia.org/wiki/Disability_in_China

This one is about the USSR but still relevant. https://isreview.org/issue/103/disability-and-soviet-union-advances-and-retreats/index.html

but to answer your question communism is based on "From each according to his ability to each according to his need." so as long as the material conditions allow for it mentally disabled should be treated well. https://www.scribd.com/document/256390020/Disability-Studies-a-Historical-Materialist-View

I think China is better toward us Autistic people.

Can't speak to everything, but I remember reading about special schools and workplaces for (I think) autistic people. Places where the person's individual strengths and sensitivities are respected and where the people are able to really thrive. It could have been something like a restaurant and a workshop with caretakers and maybe even parents present.

I'll try to remember to find the article when I have time.