How did Pete react when Mary announced that she didn't want her mother to return from the mental institution?

While driving home from a Liar's Club meeting with her father, Mary announced, against her better judgment, that she didn't want her mother to come home from the hospital if she was just going to go back to treating her family the way she did before being admitted. When he heard this, Pete pulled his car over on the side of the road and shouted at Mary, for the first time in her life, that he didn't ever want to hear his daughters speaking about Charlie that way.