Sometimes you have to fire a customer. Maybe you let your emotions get the better of you within the moment but if this is an isolated incident, learn from it and move on. I fired a customer recently and felt awful about it initially because I could have handled it better. Now, a few weeks removed, I feel great about it because I never have to see this entitled person again and my staff is happier knowing they won’t be abused by her anymore and that I have their back when someone is treating them with disrespect.