It's bad to show off in front of your peers.
Mark is playing basketball against a less skilled player and his friends are watching.
Mark wants to win the game decisively.
Mark focuses on the game and outscores his opponent by a large margin.
Mark does a bunch of flashy tricks on his way to victory demonstrated the skill gap between them.
Mark's opponent is impressed by his skills and strives to improve his own.
The less skilled player is embarrassed and loses his desire to play in the future.