Your stuff is good as always, Fault. A lot of stuff made in SAI tends to have a certain look to it regardless of artist, but yours looks quite distinct.
Don't you think it's more impolite to tell someone who is autistic that they're psychosocially abnormal?
No. That's a literal truth and probably the most value-neutral non-judgmental way it can be said.
Some autists have difficulty surviving on their own and you might consider them mentally disabled, but there are plenty of people in the world who aren't autistic or are even considered mentally disabled who do far worse than the average autist. As far as I can tell, most autists are just different in a sufficiently similar way that they can be identified as a group.
Nothing I said is in any way counter to this.
To say that they're abnormal is absurd to me, because if there's one thing that I'm certain of it's that there's no such thing as 'normal'.
There's no one "normal" that can be applied to everybody, but in all aspects of a person there's a range of normalcy. People with autism spectrum disorders, at least ones sever enough to merit a diagnosis, are outside the normal range in a specific way. That's not necessarily a bad thing, although it can be very inconvenient at times. But it's nonetheless a true thing and an adequate descriptor.
It's not an insult to suggest that someone is autistic. It's far more insulting to suggest that suggesting someone is autistic is an insult.
It's not an insult to say someone's autistic if it's true. But it's still not appropriate to go deeming someone's autistic on the internet, as it is to go attributing any quality to someone. You could just as easily have said "I'm 100% certain that . . . . . . . . . is black" or "I'm 100% certain that . . . . . . . . . is a woman" or "I'm 100% certain that . . . . . . . . . is gay". There's nothing wrong with being any of those things, but nonetheless calling somebody those things is offensive, both to the person in question and to other members of the demographic you're bringing up.