No, snobbery is being a douchebag for no good reason.
We’ve already discussed The Warriors, it’s a piece of crap. And you even admitted the dialog sucks.
At this point what we know is that what you consider great art is probably the dumbest list in the world. Basically it has to be complex, and it can’t be popular. Of course film can be great art, anybody that thinks that’s even a question has crawled up their own ass into stupid land.
The issue with film is this...if you think of the greatest films ever made (whatever you consider them to be), do they even bear comparison with the greatest works of other media? Hitchcock vs Proust? Kurosawa Vs. Mozart? Lubitsch Vs Rembrandt? The filmmakers look bad in comparisons like that. I think it has something to do with the fact that film is a collaborative medium where the expressive weight is diluted (acting, writing, photography, music).