Sorry, didn’t make that clear — it’s the other customers.
It’s the behaviour of the other customers.
It’s the behaviour of some of the other customers.
And the noise.
And the television that attracts my attention even though it might be silent*, even though it’s showing sport in which I have no interest.
[This could be my 100 words for the day…]
*Business receptions are even worse, tuned to a rolling-news channel with the sound off. All you get is the repetitive ticker along the bottom, and guessing games: “What’s this location report about?” “Who’s that being interviewed?” “WHY???”