In the US, a business can refuse service to anyone, generally, as long as it isn’t because the person belongs to a protected class (e.g. you can’t ban all black people or all Jewish people). You could refuse to do business with someone because you didn’t like the way they looked at you, or because you were grumpy the day they came in.

Famously, for example, James Dolan bans all sorts of people he doesn’t like from Madison Square Garden and any of the other venues he owns. He notoriously bans all lawyers who work for any firm that sues him (which happens a lot). He even uses facial recognition to catch them, and kicks them out without refunding their tickets. People have tried to sue him for this (many of them are lawyers, after all!) and so far no one has won against him for it, so he keeps doing it.

Here is an article about it: https://www.espn.com/nba/story/_/id/45949758/new-york-knicks...