If there's no one else to talk to, I would have that plain vanilla introductory conversation many of you would have with any stranger at any group meeting you're new to (language exchanges, home improvement clinics, conventions, vocational courses).
Under those circumstances, I would never mention any of my 'disagreements' with his modus operandi. However, should he attempt to judge me for my wrongdoings, I would go into defensive mode and expose any arguments againsts the way he approched every situation related to my wrongdoings.
I would definitely apologize to him should he prove me wrong for any justifications regarding my actions, but definitely I would not apologize for CTB.
In any case, I might try to hold a calm conversation with him (although I might also do the opposite), but I would certainly not abandon the use of satire, sarcasm, nihilism or cynicism should I sense any social toxicity in his speech.