What are the ideas and/or people that Holden pushes away in The Catcher in the Rye?

Holden Caulfield rejects the idea of the American Dream and has no motivation or desire to participate in the competitive economy and amass a fortune like his father and other adults. Holden also rejects mainstream American culture and detests the entertainment industry, despite the fact that he continues to attend shows and performances. Holden does not value money or material objects like many Americans, nor does he wish to attain an upper-class social status as an adult.
Holden rejects the idea that he should earn the respect of his peers and wishes to live in the woods by himself. Holden also rejects the American education system and chooses to flunk his courses. He does not desire to earn good grades, graduate school, or find a job. Holden is also dismissive of successful adults and peers. Holden views successful people as "phony" because they are often insincere and flaunt their accomplishments.
Holden's fear of conforming to mainstream American culture and entering the world of adults influences him to push away compassionate individuals who genuinely care about him. His general malaise and cynical attitude prevent him acknowledging their sincerity and reaching out to those who care about him the most.

By intentionally failing or provoking his removal from a succession of schools, Holden "pushes away" the imminent reality of graduating from high school, because it is a rite of passage that will symbolically remove him from his childhood and place him in the world of adults. Because Holden equates adulthood with a sort of corruption, he does all he can to forestall its arrival.
Holden rejects Sally Hayes because she is the epitome of the "phoniness" he despises in the adult world that awaits him. Holden is from an upper-middle-class family, just like Sally, and he is desperate to avoid a life consumed by its values. He does not want to make a lot of "dough," like his corporate attorney father, or join social clubs, wear their clothing, and adopt their tastes in art, or accept any of the notions that he deems artificial, inauthentic, and fraught with the kind of expectations that he fears he can't meet.