30 Bad Table Manners: How Many Are You Guilty Of?
Gourmandize

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Constantly being on your phone
Meal time is sacred and should be unperturbed by incoming calls or texts. You can check your phone a few times, in case there's an emergency. But don't talk on the phone while you're at the table or be texting or playing games. It's rude to your dining companions, and it sends the message that you're bored by their company.