Yeah, the "SJW-inspired" phrase made me cringe too. As for majority or not, this is totally anecdotal, but all I can say is that every Autistic adult's blog I come across seems to have Strong Feelings about the matter, whereas blogs written by (presumably) neurotypical parents about their Autistic children either don't even notice the linguistic difference or explicitly use the "with autism" construction. It's enough to give you whiplash.

Also, one can distinguish between "he is a person with autism" (not so great phrasing, implies autism is a severable condition) and "he has mild-moderate autism" (better, more specific/accurate meaning). The latter does not seem to be such a big deal, and I do use it myself.