Consiglio: If you have an especially good experience with a customer service person, (in addition to a nice tip, if applicable) be an “anti-Karen” and ask to speak to their manager about what a great job they’re doing. It makes the employee’s day and can help them get promotions.

I once had a manager who didn't like me that much, but the customers loved me and kept saying so, and now I have that manager's old job. Positive feedback is so rare in customer service. It's 99% complaints about stuff that isn't your fault. But those few kind words from customers helped me get through some hellish shifts and advance in my career.