If two people enter a coffee shop, is it ever acceptable for the first person to sit at a free table while their friend orders, even if there are already people queuing who don't necessarily have a friend there to save them a table?
Depending on the size of the queue, I think it may be acceptable to claim a table beforehand when there are clearly enough tables for everybody, but what if table space happens to be very limited? Am I being unreasonable to think this is queue-jumping?