As far as I know, the only person who has diagnosed Richard Stallman with anything is Richard Stallman, and I doubt he has even an honorary doctorate that would qualify him to make such a diagnosis. Maybe he is neurodivergent, maybe he isn't. If he were, that wouldn't excuse his behavior, as plenty of neurodivergent people don't act the way he does. It's not a "get out of social consequences free" card.

And honestly, if Richard Stallman is so neurodivergent that he isn't capable of interacting with people in a reasonable way, despite being middle aged and no doubt having been told about his behavior many, many times, he shouldn't be in the position he's in.