My joke wasn't about autism at all, but hey, it's f***ing awesome to be the joke police. Jokes are fine, unless they offend YOU personally. I'm super glad your line is the exact line where things JUST AREN'T FUNNY.
Edit: For the record, I wasn't trying to offend you, or even be offensive. I don't care if you are offended even a little bit, but that wasn't the aim of my joke.