Oh Yes! I think it's another form of complete lack of awareness. Surely it's common sense that if you're in a huge queue, you try to be served as quickly as possible and not faff around chit chatting or asking unimportant questions and be prepared such as having your card/cash etc ready in your hand.
@Badbadbunny God yes.
Recently DH and I were at the monthly Sunday market in our town. A very popular event, especially close to Christmas. There was a stall where a man was selling his charcuterie and this was very popular and had a long queue. However, we liked the look of his stuff so joined the queue.
It soon became apparent that the queue was slow moving because:
a. There was only one man serving
b. Although some of his produce was pre-packaged a lot had to be cut and weighed to order, e.g. air dried hams off the bone, big spools of sausage where you could buy just as many as you wanted.
The woman in front of us, when it was her turn, then decided to engage him in conversation to show off what a knowledgeable foody she was about exactly what she was going to use it for (a carbonara), what other types she had tried last time she was in South West France, exactly where he had trained and blah, blah, blah.
FGS woman, you have just queued for nearly 20 minutes like the rest of us, why do you think it is OK to make everyone behind you wait even longer while you show off?