P was frustrated because a friend didn't invite him to his birthday party. Apparently other kids convinced the birthday boy not to invite P because P is the best poker player in his class and he would win the top price from the party's poker tournament. This statement from P prompted a bunch of feedback from me:
1) Don't say "I am the best poker player in the grade". Even if it is true, it comes across as arrogant. You can say you are a good poker player, or maybe one of the best.
2) Don't believe the reasons people give you for why they did something. Often people don't know themselves why the did something, yet when asked why they rationalize it and make up a reason that they often believe to be the truth - but it was conceived after the fact. And when people do know why they did something, they often rather give a more "comfortable" explanation than the truth.