"You're not autistic"
When I was a kid I purposefully stretched out the collars of my shirts because anything touching even close to my neck made me feel like I was going to throw up. I never drank water, and lived the first 17 years of my life perpetually dehydrated, because I thought water, a tasteless liquid, tasted disgusting. I have an encyclopedia an inch an a half thick on animal species completely memorized. I can tell you more about the intricacies of the German political landscape before and during WW2 than I can about what I did yesterday. I only like social activities if there are less than 25 people, all of which I already know. I require very, VERY detailed instruction and several examples before I do any new thing. I chew my nails, flap my hands, and play with my favorite rocks. But sure, I'm not autistic.