It is pretty embarrassing to get fired for being a customer. It means the person providing you a service would rather not get paid if they don’t have to deal with you anymore. It would make me think if my personal trainer, cleaning lady, or piano teacher fired me. It’s not like the people working those jobs are getting paid a salary. They are getting paid hourly, maximizing their income by meticulously calculating how many customers will pay them the most. If they’re good at their jobs, they don’t want to waste their time with horrible clients when they’ve got a list of potentially great clients knocking down their doors for their services. Some work-for-hire professionals can’t afford to turn down a client or fire one. Once they get enough experience and income to do so, they probably have a couple of names at the top of their list they’d love to nix.