Three. Contempt, which is the serious one

Contempt is anything that communicates that you are above the other person. The eye roll. Mockery, including the funny voice. Name calling. Sarcasm delivered in company. The sigh with a shape to it.

Of the four, this is the one the research group singled out as the most corrosive, and it is the one people defend hardest, usually as humour or as honesty.

There is a reason it does more damage than shouting. Shouting says I am angry with you. Contempt says I have already decided what you are. Nothing can be repaired by a person who thinks you have concluded that about them.