Ha ha...it is the Seinfeld soup nazi experience, but the dim sum is mediocre. You just can't take offence to this behaviour. I've tried something new while eating out at rude Chinese joints, just play with them. Just continue with your conversation when they throw food at you. Since service doesn't exist, the server's existence is inconsequential. I'm only upset that the food wasn't awesome to justify spending almost two hours of my Saturday in a dingy hole.