"But he doesn't look like there's anything wrong with him"

Arrrrrrrrrrrrgh!
If we all had a dollar for that comment coming our way we'd all be millionaires.
And the ignorant twats would be begging our forgiveness.
No, that's too harsh, some people aren't ignorant they just don't know any better.

But, fark me sideways over a barbed wire fence, can people pulllleeeze try to put their brain into gear before opening their gob, cos once those words are out everything changes.
The whole dynamics of a friendship instantly evolves before you can blink the moment those sounds hit the parent's ear drums.
Do you seriously think those words are in any way, shape or form helpful, supportive or wanted when someone informs you that their child is on the Spectrum?
Autism/Asperger's doesn't come with a blinking neon sign to alert everyone around them unlike someone in a wheelchair...although I did overhear some numb-nuts saying to a person in a wheelchair recently "You look like you should be walking."
Yeah, cos those magic wands are sooooo farkin' reliable.
My darling geek kid commented that if he's ever faced with that situation that he'd love to reply,
"Really? And you don't look like you're missing a brain!"