I'd say it comes under the 'instrumental rationality' heading. The chatter was clearly bothering the writer, but - irrationally - neither he nor the others (bar one) actually got up and said anything.
The passage states that he'd already spoken to them twice.
Not long ago a couple across the aisle from me in a Quiet Car talked all the way from New York City to Boston, after two people had asked them to stop. After each reproach they would lower their voices for a while, but like a grade-school cafeteria after the lunch monitor has yelled for silence, the volume crept inexorably up again. It was soft but incessant, and against the background silence, as maddening as a dripping faucet at 3 a.m. All the way to Boston I debated whether it was bothering me enough to say something. As we approached our destination a professorial-looking man who’d spoken to them twice got up, walked back and stood over them. He turned out to be quite tall. He told them that they’d been extremely inconsiderate, and he’d had a much harder time getting his work done because of them.
“Sir,” the girl said, “I really don’t think we were bothering anyone else.”
“No,” I said, “you were really annoying.”
“Yes,” said the woman behind them.
“See,” the man explained gently, “this is how it works. I’m the one person who says something. But for everyone like me, there’s a whole car full of people who feel the same way.”
-- Tim Kreider, The Quiet Ones
-- Betty Medsger