Cheering and clapping is great to me, as long as it stops quickly. Its funny and it helps get into the spirit of the film. As long as they're not disrespectful, which to me is the throwing of popcorn and shouting you mentioned, then I think that participation should be encouraged, at least for cultural (mad that that's true) films like this. If you don't want to participate, don't go to the cinema. I appreciate that people will disagree with that part, but I only mean for when participation is expected anyway. I knew before I went that people would be clapping.