But there's one important place they're often forgetting to pay gratuity altogether amid the "tipflation" debate, according to one etiquette expert: hotels. Hotel housekeepers are often stiffed on gratuities — but it's a service you should "always tip on," Diane Gottsman, founder of The Protocol School in Texas and a nationally-recognized etiquette expert, tells CNBC Make It. Plus, like many service workers, some hotel housekeepers might rely on gratuities to help make ends meet, Gottsman points out. 5 times it's OK not to tip, according to etiquette expertsDo you always need to tip 20%? Here's how much an etiquette expert says to leave at restaurants, hotels and more

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Persons: Diane Gottsman, Gottsman, They're Organizations: Protocol, CNBC, housekeepers, Bureau of Labor Statistics, American Hotel Association Locations: Texas, …, U.S