That he treated you nicely, does not mean he does this universally. For him the contempt is less about intelligence or competence and more about his extremely rigid world view. When he's surrounded by his admirers of course he doesn't do it. But when someone turns down his lascivious advances or offends one of his random moral positions he behaves entirely differently.

But I mean, you can just go read the guys blog for content that would clearly bar him from ever holding a position of influence within most corporate businesses. No one wants an evangelist/spokesperson that is blogging about how "voluntary" pedophilia should not be a crime.

No one is canceling Stallman unfairly. What's getting canceled is a free pass he never should have been granted in the first place about this behavior.