>>16605384Because it's a way to say awkward, doing something obsessive, commonly breaking folkways, general wrongness etc rolled into one word. Not correct, but there's not really an actual word for it. As kids this "word" tended to be "gay" or "retarded". On 4Chan it's autistic because this a lot of actual people with autism like 4Chan create everything that bothers them. This site is also bitter about other sites taking their content, memes, whatever, and using "autistic" this way would never catch on to Reddit or Tumblr.
