Comparing Catcher in The Rye and Great Expectations

So in the opening sentence of JD Salinger's Catcher in The Rye, he mentions how," David Copperfield and all that crap," an allusion to Dickens book David Copperfield. So I read the Wikipedia on David Copperfield and it sounds kinda similar to what I've read so far in Great Expectations. So why is Salinger trying to distance his character from David Copperfield? Well like Dr Preston said today, Pip realizes that his expectations have always been there, and that everyone borrows them at one time or another in life. So it's like a big cycle. I think that Holden Caulfield wants to distance himself from that probably because he feels it's goddamn phony! No but really it seems to take away free will and the ability to choose your goals, etc. So when Holden says, "Where do the Ducks go?" I think he's talking about the realization that his goals were never his, and now he seems to have no direction in life. Salinger obviously put this allusion at the start to keep this on the minds of his readers.