The customer is usually not right, but hell hath no fury like a Cobb salad Karen scorned. If you've worked in retail, you've probably had someone scream at you over a matter of three dollars and if you've ever worked in the service industry, you'll wake up in a cold sweat three years after quitting the job because you were slightly late one time bringing a side of ranch dressing for someone's pancakes (?).
Especially now when service industry and other essential workers are risking their lives to serve you, perhaps your complaint on the Yelp page that you'd "give 0 stars" if you could, can wait until never. So, when a Reddit user asked the internet, "What's the meanest thing a customer has ever done to you and how did you react?" people were ready to vent about their horror stories from the trenches of customer service.