Not even remotely autistic at all (I've been tested because I misbehaved at school because classroom instruction is boring as fuck). Explaining why the joke doesn't make sense is a form of explanation trolling and can function as it's own counter-humor. At the end of the very much correct explanation for why the joke teller is clearly retarded, then you and your pals can laugh the guy who made the retarded joke. "Brian, you're so fucking retarded. You think your jokes are clever but you constantly reveal what an absolute uneducated troglodyte you are. haha, get Brian a beer. We still love you even if you're retarded."