Have you ever noticed that as the sound level goes up in a room, people keep talking more and more loudly, driving the noise level even higher? Yesterday, in order to be heard to his seatmates on the plane, the guy behind me kept talking really loudly about everything from social security to sushi. I think he thought he was very entertaining.
persiflage
Frivolous or bantering talk; a frivolous manner of treating any subject, whether serious or otherwise.
(dictionary.com)