Sometimes when you know you are not wrong, and the other party is acting childish and emotional, sitting back and letting them go while remaining calm is the be

Sometimes when you know you are not wrong, and the other party is acting childish and emotional, sitting back and letting them go while remaining calm is the best strategy. There is a line between being calm, and being calm and egging the other party on. If you are calm and assert your points, without inflaming the other party, there is no reason to raise your voice or use other methods to make your point seem right. Facts are facts and usually speak for themselves. The manager could have also said along with the "I understand where you are coming from and it wasn't my intention to upset you. [Would you like to have a 1 on 1 or a private conversation about this?]"