Features, OpinionOpinion: We no longer know how to behave in publicPosted on August 9, 2023 CNN — The simultaneous arrival of “Barbie” and “Oppenheimer” in movie theaters has spawned a slew of hand-wringing articles about a drastic decline in people’s behavior in cinemas. More disturbingly, a number of touring musicians have had objects thrown at them onstage, in some cases causing injury, and in all cases just being completely unacceptable.