Not talking about non verbal, low functioning ones. They're basically children.
But high functioning ones. Grown adults. With jobs.
In the same way we don't allow children or mad people online, (at least shouldnt), the question is, should a person with autistm be allowed to post online and carry on with their disconnected from reality nonsense, while people get scandalized by their weird behavior because they mistake them for normal people.
Should we, in an ideal world, allow these people to have any kind of public, uncontrolled presence online in front of ordinary people.
Serious question.
Who would make the judgment call?
The only way I could see this happening is by labeling all of humanity and letting them access things based on an identification number or a chip put in the skin to give people access to what the powers that be want them to have access to. (I was typing this at the same time as TheRealMcCoy) Do we really want that?

Like Pax said, ignore it if it bothers you. If it is offensive, report it to the moderator. If it is a character flaw, rise above it.