More often than not, a "Karen"-type demanding to speak to the manager about their missing side of bleu cheese or refund on a used item they're trying to return from three years ago without a receipt, is not "right." However, any job that requires smiling and nodding while someone throws a temper tantrum about scented soap or parsley on a plate of fries can seriously make you question your faith in humanity.
Managers and owners often take the side of the customer during a confusing customer meltdown, but demanding customer service employees do anything outside of their actual job, especially when they are often underpaid, is never ok. There's a stark difference between someone going out of their way to help a stranger out because they want to, and a customer speaking to a manager about how "it's not proper customer service" for a waitress to not call them a cab to the airport and give the driver turn-by-turn directions during her shift.