Kives, this was clearly meant to be a joke – though in truly questionable taste, Bomb. Really.
But FTR, the word “retard” simply means slow, NOT stupid. There is no question that developmentally-delayed people have retarded mental development. They are in fact called Children with Retarded Mental Devlopment (CRMD) in the education system. Autistic children run through an entire spectrum of development. Some autistic children are geniuses, some are at the opposite end. In either case, no one should use the word “retard” in a pejorative sense.