Tough Choice

Part of me wants to pretend I merely "overheard" this conversation, but I know "A" & "B" as well as anyone. These aren't their actual initials, but, as you'll see, P/C wouldn't exactly work in this context.

A: It's to the point where I've started thinking if I were to have a kid with a disability, what kind I'd want it to be.
B: Autistic?
A: No, I'd want an MR.
B: MR?
A: Mentally retarded. They're just so happy all of the time.
B: Yeah, yeah. Hmm. Does a crack baby count?