My stepdad is a great and nice guy, and I've suspected for a while that he might be autistic. He's very quiet and reserved, rarely shows strong emotion. Chuckles rather than laughter. He's also fixated on certain things and hobbies, and can talk/ramble about them for quite a long time. He likes puzzles and, what have been given to him, legos. Putting together and taking apart things.
Like I said, no hard evidence, but I could see it.
There's a theory about this and the way neurodivergent people gravitate towards each other due to similar communication styles. Has to do with the double empathy theory as well. I wish I'd have a link, but I don't.
Personally once I started to see it, I see it in most of my family members and also those friends that stick around or co-workers I get along with the easiest. And I also see that lot of the incompatibility issues and fall outs that I've experienced can probably be explained by this.
Yet sometimes deeply masked fellow neurospicys can be the worst, but it does help to get where they are coming from if I can understand the masking.
I hadn't heard of that, but it makes a lot of sense.