It is rude to be hypocritical in your actions.
Scott tells his son Nathaniel not to eat ice cream for breakfast, but Scott always craves ice cream.
Scott wants to eat ice cream.
Scott waits until the evening to eat a bowl of ice cream.
Scott devours an ice cream cone early in the morning.
Nathaniel join his father in eating ice cream in the evening.
Nathaniel becomes mad that he can't eat ice cream in the morning, while his dad can.