Why did the postmates guy flip out when I told him I'm not allowed to sell anything to him if I find out he's with postmates?

I'm literally just doing my job. The owners want nothing to do with postmates. If I see his bag even, we are to cancel his order.
Update: It isn't one driver. The owner has asked postmates to remove us repeatedly, but they refuse. We've had roo many problems with postmates and they never asked our permission in the first place.
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