Why doesn't Holden like the movie at radio city music hall?

Holden Caulfield dislikes the movie at Radio City Music Hall because he finds it phony and superficial, reflecting his broader disdain for inauthenticity in people and experiences. He is particularly bothered by the overly polished performances and the audience's enthusiastic reactions, which he perceives as insincere. This reinforces Holden's feelings of alienation and his struggle to connect with the world around him. Ultimately, the movie serves as yet another example of the "phoniness" he constantly criticizes.