It is rude to talk back to a parent.
Billy is at home where his dad is admonishing him for not mowing the lawn like he was supposed to.
Billy wants to express displeasure to his father.
Billy walks outside to mow the lawn but gives his father the silent treatment the rest of the day.
"Billy tells his father to ""shove it"" and to mow the lawn himself if he thinks it's so importanat."
Billy's dad is understanding of why Billy is upset, so he allows him to brood and is also happy to see that Billy did his chores.
Billy's father is shocked that his son is so rude and hurt that his son won't listen to him.