The described behavior of Mark is an instance of displaced aggression, where he directs his anger towards the server instead of addressing it with his brother. This reflects poor emotional management and social interaction skills.
The situation described where Mark is displaying verbal abuse towards a server because he is angry at his brother is an example of displaced aggression.
This can be the result of not expressing emotions directly to the source of one's anger. Instead of addressing the issue with his brother, Mark's emotions manifest in abusive behavior toward an innocent third party, in this case, the server at the restaurant.
Understanding such interpersonal dynamics is crucial for both personal development and healthy social interactions. It is also important to acknowledge that verbal abuse, regardless of the underlying cause, is unacceptable and can be detrimental to the well-being of the individuals who experience it.