A mentor at the Red Rooster Tavern taught Mel Robbins which diners actually influence the tip, sparking debate among hospitality and etiquette experts.
https://www.foxnews.com/food-drink/ex-waitress-reveals-restaurant-tipping-secret-most-customers-dont-realize-expert-calls-bad-hospitality
https://www.foxnews.com/food-drink/ex-waitress-reveals-restaurant-tipping-secret-most-customers-dont-realize-expert-calls-bad-hospitality