Not going to flame you. I would hope that we can discuss - and disagree - civilly and without attacking one another personally.
But I would disagree, given the whole of the sentence, that it was anything but an insult. I don't think he was speculating that his dad might be on the spectrum.
I understand that he's broken, I do. It's awful for him, that's his dad. He's hurt.
But it's still not ok. And it simply highlights the need for education.
I am tired, for example, of reading about some abusive arsehole and then waiting for the inevitable post of "sounds like he could be autistic"
There's a serious lack of understanding.