Shaun is angry at the way a coworker has treated him. shaun feels justified in his anger because he believes that anybody would feel the same way if the same thing happened to them. this example reveals shaun's susceptibility to the:

This example reveals Shaun's susceptibility to the "assumed-similarity bias".

Assumed-similarity bias refers to a psychological alternate way that leads us to the oblivious suspicion that others share the same or comparative values, considerations and convictions. We consequently accept that others are much the same as we are, particularly with regards to the crucial parts of our characters that are so fundamental we never at any point give them a doubt.

You could solve them by trying something new that everyone can agree on or make a decision too.