What are Holden's reasons for disliking the school in J. D. Salinger's Catcher and the Rye?

has been
expelled from other expensive boarding schools, so it is clear he has issues with school itself.
Pencey is just the latest failure.

Holden, who tries to live authentically,
doesn't seem to be able to adapt to what he feels are the phony cultures of his school. First,
the academicsexcept for writing, which he enjoysbore him. Second, he dislikes the phony people
he encounters, such as his roommate Stradlater. Further, he loathes what he considers the phony
alums who come back and lecture the boys about "success" and following
Jesus.

Adding to his other issues, Holden is depressed...