They spat in his face and said, "Thank you, Lord, it's raining April showers." For someone who has lost their self-respect, the reaction you show is not a punishment but feels like a gentle rain falling upon them. The most effective way to deal with these kinds of "shameless" attitudes is not to try to explain things to them, but to turn the distance into an insurmountable wall. Because every new chance given to someone whose value system is undeveloped only creates a new area for abuse.