Why is Dwyer angry with Quinn? Do you believe he is justified in his anger? Why or why not?

Dryer sees Quinn's participation in the protest as a betrayal. Dwyer grabs Quinn and asks, “What the hell, man?” and reminds him that Coach banned them all from going to the protest. Dwyer doesn't like the optics of Quinn, a white boy, doing this. Quinn is just standing up for what is right: it is a very courageous move.