Catcher in the rye: How is Holden responsible for his own isolation?

i need to write an essay about '; to what extent is Holden responsible for his isolation from society.'; however i can only find a few examples. does anyone have any references of parts where it shows he is responsible for his own isolation?Catcher in the rye: How is Holden responsible for his own isolation?
Holden says he doesn't work too hard in school multiple times in the book.Catcher in the rye: How is Holden responsible for his own isolation?
It's been a long time since I read the book, so I'll just say that ';to what extent'; means ';how much'; rather than ';how.'; Your task is not to prove that he is responsible for his own isolation but to explain to what degree he is responsible for his own isolation -- slightly different.