As a mum to a boy with AS and a (new) DP with an AS diagnosis, I agree very much with DaVinciNight and siiiiigh ...
On a practical note, I would say that your DP somehow needs to be made aware of the contempt, rudeness, sarcasm and irriation he displays and how it affects you. What else is there to do? If he doesn't realise what upstes you it will just take him an explicit explanation, so he realises. He should be told, in a moment of calmness, that sarcasm just confuses 2-year=olds, that they are still unable to modulate their own emotions and we therefore can't expect them to turn reasonnable after a quick chat, and that put downs have the effect of making you very angry rather than solve the issue. Or - I don't know, but it needs to be explicit! And also, that failure to change is putting your relationship at risk, because you feel taken for granted and insulted... I think that then, depending on his reaction, you'll see if it's the case that he didn't see it, or that he doesn't care...
DP will always, for instance,I think, have inflexibility problems. When plans change, he doesn't complain, but I can see he is put out - although he denies it, and tries hard to adapt and be graceful. I can just see it in his eyes for a few seconds...
In times of stress at work it has created problems for him in the past. Maybe the OP's DP's work doesn't create the kind of frictions he reacts to? Maybe, it being the workplace, he has a clear template for the times it goes wrong? I agree you can expect, for a man with AS, a close relationship and parenthood to be v hard to navigate... So far, I have seen DP respond inappropriately to people at his workplace when he has been stressed... I expect it might happen to me too, and am getting ready to have to be explicit about what I can't accept...
He has said to me (we talked about alexithymia) that he has trouble understanding words that have to do with feelings; this also coming from someone with great language skills (fluent in 4 languages - including mine, which is not his, to an amazing degree); Yet when I write to him talking about my feelings, his replies are always way off the mark; he manages to completely misunderstand me, and even understand the opposite of what I write, until he gets upset or reassured by things that I would have thought would have the opposite effect; it's like he picks up on a few key words and remake his own letter...
I found it hard to believe at first - that he finds it hard to see sublte differences in adjectives that describe emotions - yet it makes sense, in light of him not understanding me, whereas he is v intelligent and perceptive in other areas that he is more familiar with - and he has shockingly poor insights in his own behaviour sometimes...
If you don't love him and want out, though, that's another thing... I persist with DP because I really like him and want it to work...
When you explain how you feel to him, it might take him a while for it to sink in btw, and you might have to be explicit in checking he's understood, as he might not seek clarification.
I hope I haven't 'transferred' (or whatever the word is) too much of my own experience onto yours... HTH. Good luck!