What is a disability supposed to look like anyways?

Those of us who have Asperger's have the same problem that this young girl has.  Next time I tell someone about my Asperger's, and they say they don't see it, or that I don't look like someone who's autistic, I'm going to ask them what Autism looks like. Just like I'm sure that this girl would love to ask people who doubt her having a disability what a disability is supposed to look like.