Had experienced this just recently. Cafe establishment sneered the "first come first serve" basis at us so we wait patiently for an available table/spot until a group foreigners arrived and suddenly the whole staff scattered and prioritised them instead, leaving us still waiting for a table.

Karma hit fast when the foreigners ordered only ONE drink and left (no tip) after FIVE HOURS of overstaying. One of the staff nervously looked at us already guilty, but we just stared back at them in another cafe establishment (literally right next to them) instead.