When my friend, Ray, was young he had many uncomfortable meetings with his boss. He usually felt intimidated, was belittled, and often felt his boss hated him. 

Years later, when Ray's boss departed the organization, he said to Ray, "Don't forget who trained you!" Until that moment, Ray never realized that this man was working to train him to become a better leader.  

Many old school leaders believe harsh treatment to be an effective way to train others. 

In Luke 6:40, Jesus said, "The student is not above the teacher, but everyone who is fully trained will be like their teacher." 

When you train others, ask yourself, "How would you prefer to be treated?" Your style of training may or may not result in your mentee doing likewise to others later.