It all depends on severity of disorder. A full blown Chad is not going to get anything if he is below high functioning autism. Some of these diseases and disorders actually prevent Chad from becoming. Take someone so autistic or with nerve damage that they can't comport themselves properly. The kid from Breaking Bad is a good example of this. But he's mastered his difficulties enough to become Chadlite plus celebmaxxing.
If you can't literally hold your body properly you may be Chad tier but it takes a little more than existing; you have to be present too. If Chad can't hold his head up right, can't walk, or even moreso can't speak, then it's going to be over for him.
Also you can be Gigachad but if all you can do is bark at girls like a dog - I mean in the Missasian sense not pop-culture - then you'll just scare the shit out of them.
Chad can be autistic/have Aspergers alright. But he can't go full blown unrelatable. Then again there's sick twisted foids that go for serial killers on death row so you never know.....