If you don’t clap after a movie you have no soul. I only go to big movies though so maybe TrueMovieBuffs just look around disapprovingly.
It’s how us white American people show gratitude for non-hostile entertainment. “You didn’t crash! Horrah!” “The movie wasn’t real and nobody died because there are credits!” “The play is finally over!” clap clap At least I think so. I don’t get out much.