It really seems this is overwhelmingly about communication, not about CoCs or the norms specified in a given CoC.
It's not even "I violated the Code of Conduct, so I got banned from the conference", we didn't even get that far because just communicating the "I violated the Code of Conduct" part was already a debacle.
The post isn't about being cancelled, it's about an awful experience that caused the OP to burn out on conferences, to put it mildly.
Not even in the worst straw-person SJW interpretation of CoCs would this be the intended outcome.