Why did darry feel hatred for paul holden how did ponyboy react to the hatred?

Darry felt hatred toward Paul Holden when the latter confronted him at the rumble. Paul looked at his former friend with an expression that might have conveyed hatred, pity or contempt. Ponyboy didn't like what he saw. Ponyboy thought that Darry was jealous of Paul and that he was ashamed to represent the Greasers. Ponyboy watched Darry and Paul staring at each other and said that they shouldn't hate each other.