Okay well, maybe you need to define your understanding of genius and 'intelligence'.
Autism translates to a million different things nowadays and I feel it's too easy to dismiss the ideas of people who think differently than you do or aren't making 'sense' because they have an entirely different conceptual framework.
Did you know that people used to think the Sun revolved around the Sun? That was just common 'sense'. When an autist like Galileo proved them wrong, his contemporaries spent decades doing damage control, discrediting him and coming up with wasteful bulk theories and ideas so their superiority and sense of sense could be preserved.
I'm not saying every autist is a Galileo or a James Joyce.. But just that if you dismiss a kiddo just because they seem brain damaged or too stubborn/different than you, you miss out on what potential they have. In a genuine sense, not some hallmark one. The longest piece of literature in the english language is a fucking super smash brothers fanfic with the author going to team up with all his favorite characters (again, just like Dante's Inferno), that should say something about how we assign our values and what's 'valuable' in any sensible meaning.