The Question and Answer section for The Catcher in the Rye is a great resource to ask questions, find answers, and discuss the novel.
Are you referring to the title "Catcher in the Rye"?
Holden feels that his brother is "selling out" his talent. Holden thinks most people live a "phoney" life . He feels a real artist would not work to profit from his art, especially profiting in a "phoney" place like Hollywood.
Holden increases the tension. He smokes a cigarette in the room just to annoy Stradlater. Holden asks Stradlater about his date with Jane, and Stradlater refuses to give him details. This leads to Holden attacking him.