I actually lol'ed when I read that explanation of the group.
I see it like this:
There's only a handful of members on there, the long-winded rambling group info is so full of factual errors that nobody serious about autism would bother reading more than a few paragraphs, and it's clearly by someone who's had an awful experience with someone who happens to be autistic and is using that group as her way of dealing with it. Which is fine; we all deal with trauma differently.
John Best, I'm positive is on the spectrum himself and his hatred of autism/AS is simply his way of dealing with his anger at realising he's not 'perfect'. He's probably terrified of ending up like his son, or of his son not getting better and not having anyone to care for him when John himself is gone etc. To me he reads like a scared parent angry at the world for his son not being perfect, and using his rantings and ramblings to vent that anger. He's totally obsessed, sees things totally black-and-white, stubborn as hell... all of which I'm sure we can relate to.
So how about we just ignore the group (report if you want), stop fuelling the fire, and let Best get on to deal with his frustration and his anger and his grief the way he needs to.
I genuinely feel very sorry for the man.
_________________
We are a fever, we are a fever, we ain't born typical...