In the autistic twitter community where I and a lot of other advocates spend our time we are inclusive and speak frequently about ourselves as a culture -- not as a monolith, mind you, but as a culture. We disagree frequently about everything from IFL/PFL to whether or not Autism should be considered a disability, but we recognize that we're all Autistic and we're all doing our best to make the world a safer place for all of us.
This is where the disconnect is coming from. Twitter 'communities' are a tiny minority of persons. They do not represent the everyday person. This is particularly so with autism, as autism frequently entails social difficulties that get people ostracized from the communities they attempt to join. Twitter, in particular, is quick to ostracize, and you should therefore consider that "Autism Twitter" contains only the subset of autistic persons who can socially pass as conversant, and who choose to be vocal on social networks.
Hell there's even a line near the end where I say that there are Autistic people who would disagree with every single line I have written, and that they are worth listening to as well.
So like... what's the problem?
How much more defensive can you be without not writing an article? And we do need _somebody_ to write about what is a fairly pressing problem in coverage of autism?