Well, he tells non-autistic people to make lemonade, specifically. Guess who the "lemons" are in this metaphor.
Popular fiction both shapes and reflects cultural attitudes. In a previous post, I picked apart the film Adam and expressed concern over the film's troubling conclusion that people with Asperger syndrome—and by extension all autists, since Asperger's is thought of as a "mild form of autism"—are simultaneously too childlike and too threatening to maintain healthy romantic relationships.
This is a reflection of the attitude that pervades Tony Attwood's A Complete Guide to Asperger's Syndrome, a popular nonfiction book that often serves as an introductory text to Asperger syndrome for lay readers.
There has been disagreement among researchers and diagnosticians about whether the two diagnostic labels really represent distinct conditions since Asperger syndrome first became its own recognized and "official" diagnostic category. There are multiple sets of diagnostic criteria for Asperger syndrome, but recently the criteria put forth in the APA's Diagnostic and Statistical Manual have been thrust into the spotlight. A proposed change to the upcoming DSM V would consolidate all of the diagnoses on the autism spectrum under a single diagnostic label, "autism spectrum disorder." In popular discourse and mainstream media outlets, the other conditions on the spectrum—childhood disintegrative disorder and PDD-NOS [pervasive developmental disorder-not otherwise specified]—are completely erased. The focus is solely on "classic" autism and Asperger syndrome, and the proposed consolidation of the two labels has given rise to fierce controversy and even panic.