As someone that can still live a somewhat normal life, I am of course far less negative feeling about my autism. But I know many people that can’t get their body to do what they want it to do in the very least. And while they have many good days and do enjoy some of the benefits of autism, overall they are certainly not as positive about theirs as I am with mine.
For me, just hanging out with other like-minded people gets rid of any negatives I have with mine. But some have much greater challenges that can’t be mitigated by even a specially crafted environment and comfortable social situations.