Some people just don't think.
I once sat in front of an old man at the symphony who sat there fiddling with a plastic wrapper from a piece of hard candy for several minutes.
My fiance (now husband) finally got fed up, turned around, and said, "Excuse me, could you please stop rustling that?"
The guy stopped and I thought that was that but then my fiance got up to use the bathroom at intermission and the guys wife asked what the young man said to him.
Old dude launched in to a tirade about how he was just opening the candy (not true, it was folded and wrapped round his finger when my hubby turned round) and saying how rude my fiance was.
I don't know if he somehow didn't realize we were together or if he just thought I wouldn't call him on it.
I turned around and said, "You know as well as I do that you were playing with it and if you're any sort of gentleman you will apologize for your actions and your attitude when my fiance returns."
Of course he didn't apologize, because those types rarely do, but he didn't dare touch another candy for the rest of the performance.