One of the "violations" was this tweet:

https://twitter.com/rvagg/status/887652116524707841

I am not really against CoCs, but it seems to me that the world got so crazy that SJWs could and will run through my tweets, and then will feel offended by any remotely conservative link I share, and then will use the CoC to demand my head on a silver platter, potentially getting me fired.

This targeted harassment is by itself a damn good reason to oppose any CoC, they create more problems that they solve.