I was going to say this myself too, but got told off when someone in this group ages ago said they thought Autism Inclusivity was a terrible group etc etc..
But yes to the OP, many studies have shown how damaging ABA is, and I'd suggest you learn from autistic adults who have already walked that path and know from experience and with he benefit of hindsight what will help and what won't
Many people who go through r*pe, war, violence etc *do* develop PTSD, not to mention PTSD can show up differently in autistic/neurodiverse people ( I can find an article tomorrow when I have more time) And yes, autistic children should learn too, but please read the article above (Invisible Abuse one) because it details not so much what the student is learning, but it's more *how they're being taught* that is the harmful thing, hand over hand, forced compliance, planned ignoring, taking away basic needs, taking away communication devices (I believe Asswipe said Abbie treated her iPad as a "clutch", smh!) And by true selves, we mean that many ABA therapists place strong emphasis on neurotypical social norms, such as eye contact and get them to memorise phrases, rather than using communication as *connection* not just a one way street.
And as far as the "if you meet one autistic person" statement, yes that's absolutely true. However we would say the same thing about every group of people and every marginalised community. Two black people will not share the exact same feelings and experiences, but they would still be able to relate to each other more than a black and white person due to systemic shared experiences and cultural/social norms within their culture...same with the LGBT+ community, etc.