Culture?

I've been working up here in Reno for a couple weeks now, went to the movies the other day and watched 3:10 to Yuma (really good western, makes you think about whats right, and what your willing to do about it) and i noticed that when the movie was over, everyone took their trash out to the trashcans outside in the hallway... the last time i was in socal and watched a movie i was one of the first out, i sat on a bench and watched, NO ONE, NOT ONE SINGLE PERSON, brought there trash out, i went back in and looked at the theater and there was popcorn bags and boxed everywhere, and soda cups too, makes me wonder about the cultural differences between Mexican and non Mexican influenced culture (ok, i cant say Mexican in general, but northern baja california mexican influence certainly) about litter.
these pics are leftovers from along the New River (earlier post).