He's becoming more involved in face-to-face meetings that support his special interests and the people are nice, but in terms of creating a group of friends to hang out with, that hasn't happened yet. I wish I knew what I could do to help.
On another note, like many on the spectrum, he has had a lifelong obsession with films and movies. He has published thousands of movie reviews and actually received a complimentary mention by Roger Ebert, a movie critic who was very well known in the US. He and Ebert became correspondents and he regarded Ebert as a friend.
He is even a reviewer on the website, Rotten Tomatoes, but I don't think as a "Top Reviewer." I think you need to have a job as a reviewer to have that designation.
He is taking a filmmaking class right now in the actual production of a film, but he finds film criticism to be a better fit with his interests. I took the same class and just loved every second of it, but then, I am different from him.