You shouldn't get angry with your mother.
John's mother keeps listening in on his phone conversations with a girl.
John wants to let his mother know he doesn't like her invading his privacy.
John calmly tells his mother that it's not okay for her to be eavesdropping on his conversations.
John loses his temper and yells at his mother to get of the phone line when he's on it.
John's mother agrees to stop listening in on his phone calls.
John's mother is hurt by his violent outburst which she sees as unnecessary.