People always think bad of whatever they don't understand. It's nothing more but xenophobia. The difference is,unlike racism and homophobia, most people don't even realize it's that.
When it comes to autism, in a certain sense the non-autist people are autist in their own right. Autists often have trouble how other people think, right? But do non-autists have any understanding at all of the mind of an autist?
Now everybody understands that when you don't have legs, you cannot walk, however that there are things you simply cannot do when you got autism, is something people never understand, and quite often deem a weak excuse. But on the flip side of the coin, handicapped people often compensate their disability with an ability that is very well developed, more even than in other people. A blind often hears more than a non-blind. Many people with autism are very intelligent. Einstein is indeed often believed to have autism, and a lot of coders who work to make you able to use a computer/tablet/smarphone have this disorder... And I quite often wonder about the great philosophers of old, who formed the basis to modern science.
"Don't pity the dead, Harry! Pity the living!" (Albus Dumbledore)
If you replace "dead" with "autist" and "living" with "non-autist" you'll get to a quote I myself start believing in more and more. If I see how narrow minded the latter group is.... Eeew....