4 mistakes you should never make at a high-end restaurant, according to an etiquette expert

There are a few things customers should never do at a fancy restaurant.

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• Business Insider asked an etiquette expert what people should avoid doing at high-end restaurants.
• She said diners should never disregard the waitstaff or arrive late to their reservation.
• She also recommended checking the restaurant's dress code to avoid dressing inappropriately.

Going out to a high-end restaurant can be a luxurious experience. But for patrons who are used to more casual dining experiences...