Stallman is a genius and lives a life like an ancient Greek philosopher or wandering prophet.
Like many brilliant people who occupy that category, he has no sense of social graces. He writes down the things he thinks. He has virtually no theory of mind, no way to perceive how the people around him are going to react to what he says. In the past, that curse has granted us with great gifts as Stallman had the boldness and fool's spirit of being able to say and think things others would not. That granted us the entire ecosystem of free software, and who knows how decrepit the Internet would be without his contributions. At one point this guy had the entirety of gcc in his head. I can't even fathom the kind of brain that could do that.
The other half of this condition is that he doesn't understand a lot of the world. He has no idea how people relate to one another, how they communicate with one another. He's affected by an extreme disability that puts his social abilities on par with many children of single digit ages. What the people are doing who just drove him out of one of the last corners of social prestige he had is bullying a disabled person.
There's lots of other people that are affected by circumstances like these. Most of them are children, idly posting away on social media completely unaware that they destroy their futures. I know an autistic refugee that had academic grants cancelled because of something they said on Twitter years ago, when they were 16. Tanner Flake had a politically prominent father and said some off color things in video game communities when he was 9 and 10. Google will never forget it.
This is all so perverse. The people doing this stuff are pure evil.