@Joy69 you make a good point here. I think there is huge variation in how people (of all neurotypes) are able to deal with their overwhelm though, and of course a lot of variation in what overwhelms people.
It is really tough, though, when other people’s emotional state or physical health is a trigger for overwhelm. This is hard to get past in a relationship. My DH would absolutely say he loves me and cares about me, and he is a kind and well-meaning person. But when I am even remotely under the weather, or worried about anything, or stressed, he just can’t cope at all, goes into shutdown and sometimes has to sleep for days at a time. This is 100% not done to punish me; it’s because he uses me for nervous system regulation, and if I can’t regulate him, he collapses. And this is inseparable from his autism. It’s exactly the same for my DC.
(and had I understood this was going to be a lifelong issue and not something about his attachment patterns, etc etc, that could be worked out and ‘fixed’ with therapy, I might have made some different decisions about living together & having children etc).
Of course this is not the case for all autistic people. But it does upset me when my friends & family say (of my DH, who they don’t know as well as I do) ‘it’s not autism, he’s just being a twat.’ Not least because my child has similar issues and he’s not a twat or a narcissist or an abuser. He’s a child with a nervous system disability who may never grow up to be quite as independent in adulthood as most people are - in the same way my DH didn’t, though he masks it well.