David learned some tremendous lessons about criticism while he was fleeing from his son Absalom. Along the way a man who had hated him for years cursed him mocked him and threw stones at him. David took this abuse patiently and there are some great lessons we can learn from this account as well.
In this instance David learned that criticism often comes when we least expect it. He also learned that criticism may come when we least deserve it. He learned that criticism often comes from those who are least qualified to give it as well. And he learned that criticism is often delivered in the way that is least helpful.