I agree wholeheartedly. There were times in the early seventies through the eighties in which we applauded the conclusion of the movie, something that probably would be seen as ridiculous today as no performers are on stage.
I've actually been in theaters where this has happened, a number of times, within the last few years. Maybe the people where you live are just sticks in the mud. (Actually, what's more likely is that the state where I live is behind the times, like it is in most things.)