There is no "Code of Conduct". In civilized conversations between mature people, codes of conduct are not necessary.
I will not manage people's behavior. I'm a busy man, I have better things to do. If someone fails to behave in a civilized, mature manner, I just delete their accounts. No warnings, no notification. I don't have time for that.
If and when such a deletion happens in error, human beings with a mature and responsible character will figure out the best course of action to correct the problem.
For the truly clueless, I offer this one clue: if you offend someone--even if you are right, and the offended party is wrong--apologize. Sincerely, and without sarcasm.