Well, you could take a chance and ask the guy nicely to close his door a bit more gently. Might help to explain that the sound transmits through to your room louder than might be expected. It's a bit risky to try that because he might turn out to be a jerk and do it all the more, though in my experience they either to it a bit less or they don't change it at all. Of course the big problem is likely to be the notorious Aspie lack of people skills, which makes it hard to put on the necessary gloss when you're feeling like bawling the guy out. Though sometimes I've conveyed my anger and people have responded quite well. Depending on where you live, it may help if you're built like a gorilla - or if you have a friend who's built like a gorilla who is willing to advocate for you.
People are always slamming the communal entry gate to the terrace block where I live. By the time I get out there they've usually gone, and then I don't even know who did it. Also, the large number of offenders makes it difficult to have a word with all of them, and they're always moving, so it's not a job that will ever be completely done. I'm thinking of attaching some bits of rubber to the edges of the gate, to deaden the impact a bit. I'm rather hoping that if I get it right, the gate will bounce open when slammed, so the only way they'll be able to shut it will be to shut it gently. Trouble is, another thing they do is to leave it open, and then the wind catches it and slams it shut, so I'll have to think the project through.