What does Darry tell ponyboy that upsets him?

Darry tells Ponyboy that he is not living up to his potential and that he needs to take life more seriously. He expresses his frustrations about Ponyboy's lack of responsibility and the risk he takes by being careless. This conversation upsets Ponyboy because he feels misunderstood and believes Darry doesn't care about him, leading to feelings of inadequacy and resentment.