Autistic people are only smarter than most people because they study more than socialize.
As the brother of an autistic child, this is entirely situational
One of my close friends, Sagacity has autism, and honestly I can't even take him seriously cause it doesn't seem to be of any consequence. Smarter and more social than me by a long shot.
On the opposite side is my brother. 9th grade, reading at a 5th grade level. Refuses to work. Complete asshat. If he could figure out how to form a damn sentence on forum, he'd be banned before he hit "post." Just tonight our mom was telling him to log off and go to bed before she counted to 5, and he broke his headset. Then he blamed it on her like she threw it.
Except she told him to get off an hour ago.
Best part is, he copies me exactly. I go on a city RPG? Guess who shows up. I get drugs from a hidden lot? Guess who batons them? (I sincerely apologize to everyone on Diggy's City RPG for missing drugs, if it makes up for it he rage quit and I can see about reimbursing you in equivalent value, provided Diggy ever hosts again.) I get a tank? Guess who just joined my team and is trying to follow me. I buy payday 2? Guess who's asking mommy to buy it for him. (I don't care if it's rated M mom! I've literally done nothing for the past four years to deserve any gifts, but you will still annually spend $200 on videogames for me!)
Tl;dr- you can't brand autism. Some are really smart, great guys, some are scumbags