The actions of Joe in protesting that the referees made unfair calls is an example of self-serving bias because he believes his team is superior.
Joe in this scenario, is demonstrating a self-serving bias because he believes that his team is better than the other team.
This has led to him questioning the actions of others involved in the game such as the referees, because he can't fathom the possibility that his team, and himself, were not good enough that day.
Find out more on self-serving bias at https://brainly.com/question/1325291.