In a restaurant there are a number of different methods to refer to a table. To label them by some attribute / nationality of a person is unprofessional, and can be construed as racist. To then have that information shown to the client is an even bigger blunder.
The fact that information turns up on the bill and credit card statement that is what I consider wrong. You want to have that for your own personal method to keep track of your table go for it. But when it goes further then that, it definitely is a big no-no.
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