But look past that into what was happening.
Stallman was trying to defend Minsky who had sex with someone, a teenager, nearly 60 years younger than him on a billionaire's private island. There isn't an imaginable circumstance where what happened there was not, even in the best possible light, incredibly creepy.
His intellectual arguments were understandable in a way, but in the context of defending Minsky and in the venue they were wildly inappropriate and indefensible.
It doesn't matter how "great" you are or how socially awkward, any institution should fire you for doing something like that.