You cannot successfully argue with a bad actor in every situation. There is no definitive way to conclude an argument and force them to concede, or to revert to a state of sincerity and genuineness. It's often the case where you cannot even be certain that they are intentionally being malicious or not. You have a finite amount of time until you die.

When do you disengage? What is the ultimate response you are willing to manifest into reality against a perceived bad actor? Can you come to terms with the reality of temporal and spatial difference between yourself and "other"? Will it be worth all the effort? Did you achieve something?