Sodapop, the middle brother, gets tired of listening to Darry and Ponyboy bicker and tells them both that he can't take it anymore. All three boys are under a great deal of stress, but Darry's stress has much to do with his expectations for Ponyboy. Darry, at one time, was a Soc, a good student and high school football player with a promising collegiate career in front of him, until the boys' parents were killed. To keep the family together, Darry quit school, took a full time job in construction, and foisted all of his hopes and dreams on Ponyboy, who is a good reader and writer, and exhibits the most promise for future academic success. Ponyboy, however, thinks Darry doesn't care about him and gets tired of Darry enforcing curfews and generally acting as the parent. The tension between the two gets to be too much for Sodapop, who finally snaps.
Soda the middle brother got tired of the fighting and taking sides so be made them stop.