@SpudleyLass
It's fine if you want to ruffle feathers with the potential result that no one wants to be friends with you.
I wouldn't advocate anyone using their child to make that point.
We also do not know that all the other children are NT, chances are they're not. Some of them may well find the Op's dn's behaviour difficult because of their own disabilities.
Let's give an example. Dd was born without her hand. Should she have to put up with, in your book, the children who grab her arm and squeeze it, or who pull her round to get a better look, or who won't stop pestering her with questions even though she's asked them politely three times to stop asking. We've had to go home from places and events because of children who won't leave her alone. I'm talking about 8-10 yos, not toddlers.
I suspect you'll say she shouldn't have to put up with it?
Often the child(ren) involved clearly isn't NT. Does that change it?
No it doesn't. It's unacceptable for her to have to put up with it from anyone. And she's had that sort of thing surprisingly often, perhaps even more surprisingly often the parent is standing right by watching and not saying anything.
But if no one tells the children involved that it isn't the right thing to do, then how do they know? If they haven't realised it by 8yo, then really they need telling rather than expecting dd to put up with it.
You would spend longer with a child who didn't understand fractions explaining in different ways, and support them as they struggle with them, giving them practice.
In the same way a child who struggles with social interactions needs extra help.
Turning it round and saying the other children need to learn to be more tolerant is not going to help long term. Would you want to work with someone who constantly interrupted you? You might understand it's part of a condition, but I'll put bets you'd still find it irritating and you wouldn't choose to socialise with them.
I don't think it's fair on the child to expect everyone else to adapt to them. Because at some point they will come across someone who won't, whether for their own SEN or because they don't see why. And then the child will be left not knowing what they've done wrong. That's not fair.