During the conversation I had with the man, a young woman to our right had earbuds in, presumably listening to her phone, and glanced over at the raised voices. But she was showing consideration for others by not inflicting whatever she was listening to on everyone.
I recall a young woman in the declassified First Class section at the back of a Thameslink service one time playing an episode of Big Bang Theory out loud. Despite several people asking her to stop, she was quite rude and insisted on her ‘right’ to do it as ‘I’ve paid for my ticket, the same as you’

She stopped eventually, then phoned a friend on FaceTime (with speaker on full volume of course) and proceeded to loudly moan about ‘all these old fat people having a go at me’