It's bad to blow up with anger at a parent.
Justin's father was telling him how disappointed he was in Justin's grades.
Justin wants his father to know why his grades are falling.
Justin explains to his father that he needs more help on his school work.
Justin starts to yell at his father and tell him that the bad grades were his father's fault.
Justin's father calls his teacher, and they find a tutor for Justin.
Justin's father is shocked and upset at the outburst and grounds Justin for a week.