This episode was the 32nd in production but aired as the 31st episode in the second season.
Mom is being the jerk to Dad. She's on the phone, which she can do anywhere in the house. But she chooses to sit next to Dad, who is enjoying the game. Not only that, she's loud enough to talk over a full volume TV. So it's no wonder Dad says he's tired of her "mindless gab" when he hangs up the phone at Betty's house.