@marcan denouncing Christoph as a saboteur is not helpful, neither is pulling CoC considerations into this discussion. Acknowledge his opinion and plainly ask for it to be overruled once and for all.
Anything else, like calling him a saboteur needs to come with proof of sabotage. And for calling a CoC violation you better point out exactly how and where he's violating the CoC.
You have different styles of communication. That's what this is AFAICS, no more, and no less.