just concerned that general trend of thread was to assert that every disablist comment in every context was horrific, and I don't think that is right or helpful to the general debate
well, disablist comment (i.e. insult) is as horrific/not-horrific as racist or sexist comments. Calling someone an 'autistic piece of ' (presumably is 'shit') is, IMO the same as calling them a 'black bastard' - which I would consider completely unacceptable and horrid. Adding the word 'black' or 'autistic' into your insult shows that you consider blackness or autisticness to compound the insult, and therefore reveals an unacceptable view of race or disability.
I do feel sorry for PH's situation. And I imagine that he might be unaware of the implications of what he said - simply because disablism has not been widely and publicly addressed in the way that racism has.
Threads like this are a tiny drop in the ocean of the work that needs to be done to raise awareness. But it would be lovely if just one person who has read this thread might think twice before using the word 'autistic' (or any other disability) as an insult in the future - or challenge it when they hear someone else doing it.