Wingo's politics are mainstream for an open source developer in the 2020s. He's right about Stallman, he's right that GNU needs new, collective leadership, and he does a damn fine job maintaining Guile.
If you think it's alright to join an organization and then go out of your way to backstab its founder because his social skills are lacking, then you're free to do that.
How is calling out someone’s truly toxic behavior actively harming the foundation back-stabbing? If I were to found anything and later on I become a hindrance to it, I very much want to be called out for that.
https://rms-support-letter.github.io/
If you think it's alright to join an organization and then go out of your way to backstab its founder because his social skills are lacking, then you're free to do that.