It is known as the "Autistic Spectrum" for a reason, there are a whole range of symptoms that people with Autism have.
My wife works with autistic people (and our son has Dyspraxia) and my wife always says if you know one person with autism you know how it affects THAT one person, it can affect many different people in many different ways.
So don't say you have "no sympathy with autism" when you probably know almost nothing about it.
My wife works with some children with autism who are "non-verbal" but many others can speak with no problem, others with autism are knows as "runners" because if you don't keep hold of them they run off even into a road full of traffic, others will "chew" things like furniture, others have a fixation with things (one young person we know with autism loves space and the solar system and the ONLY thing he can talk about is that and always takes the conversation back to that.
Autism is a very complex illness.