It's hurtful to disparage your friends.
Ken is playing basketball with some friends when a friend on his team misses the throw.
Ken wants to respond to the missed throw.
Ken encourages his friend and tells him that he will do better next time.
Ken heavily criticizes and talks down to his friend that missed the throw.
Ken's friend appreciates Ken more and becomes motivated to play better.
Ken's friends all start thinking Ken is a pompous jerk and likes him less.