This is a very good question.  I have the vague memory of scattered booing at a couple of movies, but no memory of what the movies were.  Never attended a movie which received any sort of general or majority booing.

Several instances of applause at movies, but, again, memory is failing on what most of them were.  I do know that CLOSE ENCOUNTERS OF THE THIRD KIND got a huge round of applause at the end, and I remember a smaller but still enthusiastic reception at ROCKY.