It's indefensible to abuse your children.
Phil's son Jason comes home with a report card full of bad grades.
Phil wants to reprimand Jason for the bad grades.
Phil tells Jason that it's not good enough to have such grades and that he has to do better and tries to guilt him.
Phil slaps the report card out of Jason's hand then proceeds to slap Jason around while berating him.
Jason begins to understand how his grades make his father feel and vows to do better.
Jason is traumatized and terrified and is shocked his father is attacking him.