Another related/unrelated situation:
When I'm out and about (in my professional capacity) with a kid with a disability, I've had people make stupid comments from "What's wrong with him?" to "Can't you stop that?" (usually the kid's screaming), to "What does he have?"

I'm usually somewhere between dumbstruck and ignoring, but I did quickly respond to "What does he have?" by saying "He has a red hat."