Alienation as a form of self-protection.

". . . His cynical sense of superiority serves as a type of self-protection. Thus, Holden’s alienation is the source of what little stability he has in his life. As readers, we can see that Holden’s alienation is the cause of most of his pain. He never addresses his own emotions directly, nor does he attempt to discover the source of his troubles. He desperately needs human contact and love, but his protective wall of bitterness prevents him from looking for such interaction. Alienation is both the source of Holden’s strength and the source of his problems. . ."

Ouch Sparknotes, ouch.