People say you can separate out the unreasonable, selfish behaviour from the autism, but I'm not so sure. My DH fits the ASD profile exactly. He too could start an argument in an empty room. And once he starts, he cannot be stopped, agreed with, reasoned with, or allow that any other viewpoint is possible.
I can see that it physically distresses him not to demolish an opinion different from his... and by association, the person holding it. Which is usually me, but on occasion extends to family members and the dwindling number of friends we have left. I recently read a Reddit thread on this, which was very enlightening and gave me some comfort.
On the plus side (which complicates things, and confirms his view that he's right and everyone else is wrong) - he can also be very observant, kind, sensitive and helpful, sometimes more than I am. He is loyal, reliable, principled and super-diligent, as well as being super intelligent. Bills are paid, finances well managed, repairs are done, contingencies planned for, he's made the house easy to run. He constantly needs to be either learning or doing. He can't positively relax, or god forbid cut the odd corner - don't dare suggest it!!
That laser focus, combined with the rigid thinking and inability to engage in normal back-and-forth discussion - is exhausting, and often deeply hurtful and confusing to the partner. Latest example: I've been doing pilates for years, and have long been (gently) suggesting that it would be really good for him too. But because over those years I didn't find the exact form of words to explain the concept of 'stretching' to him - it's my fault that he's ended up stiff as a board with back problems.
Sorry for the long post, but finally I wanted to share a reply from that Reddit thread I linked to, which shows how one partner approaches it. It's not exactly comforting, but is at least an insightful response from someone who's grappled with this sh*t for many years:
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"1. I will never feel validated and that’s ok. That doesn’t mean my feelings don’t matter. It means his will always trumps mine and I need to stop seeking understanding from him. He literally cannot see it any other way than his way. If I need to hash something out, I go to one of my adult daughters or a friend. You can’t ask someone to fix something when they don’t have the tools available. If he can’t, he can’t.
2. He cannot see what I would deem as logic. His rigid thoughts are cemented. No matter how much I hurt, there’s no changing his mind until he decides differently, if he ever does. So don’t argue. Don’t use emotion. He doesn’t have a natural sense of empathy, so he can’t feel me. Rarely. If he does, it’s because I didn’t overreact and get him all keyed up first.
3. I might as well learn to discuss what is on his mind, and learn that I may not get to share what’s going on with me. If I get offended by that and try to make him see how he’s making me feel, it becomes an argument of how I abused him for years and years and that’s why he is that way. If I instead say “When you are finished telling me about “xyz”, I have a couple things I want to share with you!” I can at least get his attention and feel somewhat listened to. He feels threatened if I approach him as if he has a shortcoming where I’m concerned.
4. It’s a lonely life. I wouldn’t leave him if he had cancer, or if he was missing a limb. ASD is no reason for me to leave now. So I will be content to pour myself into our kids and grandkids and love him the way he needs to be loved. I’ll find my joy and contentment without tying it to our marriage. That’s not for everyone, but it’s what I know to be right for me. Good enough. There are amazing days where he really tries to make me happy. I will revel in those.
I’m not looking for sympathy, I’ve just finally at 50 had an epiphany on trying to find my worth through someone’s opinion and understanding of me. Once I removed the emotion from it, I can love him the way he needs to be loved and endure the rough patches. It’s definitely not for everyone, but it works for us."
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It doesn't sound like a life most of us would have chosen, but if MN teaches us anything it's that there are worse marriages out there. Hope this helps, OP. You're certainly not alone.