I would think that would be against the law.
I've been eating there for 15 years.
Been there, I don't know, BUT, if you are still concerned and you go, I suggest you record any conversations with your phone (might need to download an app) as you walk in and throughout your meal. If you have a problem, leave peacefully and you have evidence if you decide to pursue this through the NAACP or ACLU. It is not illegal to record a conversation without the other party's consent in NC. Good luck. BTW, it's cash only.
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