Went to a Concert, Faced Issues Picking Up the Car, Almost Missed It

Scheduled to pick up the car at 2:45, arrived on time but had to wait for nearly an hour to get the car because it was being washed. Washing a car for an hour? The person who handed me the keys was a Chinese woman with short hair, speaking broken English, asking me to wait because there were foreigners ahead of me who arrived earlier. We weren't even renting the same car, so what's it got to do with me if someone else is waiting? If my car is ready, just give me the keys. I couldn't understand her logic at all. When I asked her to check how much longer it would take, she just told me to wait, saying couldn't I see there were others waiting? A Chinese employee being overly polite to foreigners but arguing with a fellow Chinese customer is off-putting. Definitely not renting from them again.