I assume you are talking about when Sodapop talks to Ponyboy at the end of Chapter One after he has been saved from the Socs and Darry has shouted at him and told him off. It is clear that Ponyboy thinks Darry is unfair in the way that he is always shouting at him and picking on him, but never on Sodapop. Sodapop tries to smooth things between them, by telling Ponyboy that his big brother doesn't actually hate him and that he actually is incredibly proud of his little brother. He is just struggling with having to bear so much responsibility at such a young age because he is the father to his two younger brothers. However, it is clear that Ponyboy is not convinced by this explanation of Darry's behaviour. Note how he responds to Sodapop's reasoning:
"Sure," I said, trying for Soda's sake to keep the sarcasm out of my voice.
Ponyboy will need to experience Darry's love for him in a different way before his relationship with him can be healed.