They went out for the day- crowded pub- both decided not to order food, but she would have some crisps and asked him to go to bar and buy them. He refused saying the queue etc was too long.
This is yet another incident in a long, long marriage on the brink of divorce all the time. They live in different countries, due to work, and every time he is home they say they will try again to make things better. then something happens - such as this.
Was he out of order?