How does Quinn’s mother react to Quinn’s plan to go to the protest? Why do you think she reacts this way?

Quinn makes his way home to find that Coach had called his mother. Quinn explains that he is planning to march despite everything with Guzzo and his family. His mother tries to convince him otherwise, asking him why he's involving himself in it and dragging the family in with him. She plays the trump card by asks him what his father would say if he were here, to which he replies he did not know, but "he stood up for what he believed in."