I am torn actually unsure on what would be morally correct: 1. I, as an individual, am allowed to deny entry to persons I dislike from my private property. 2. I, as an individual, am allowed to deny entry to persons affiliated with a business I dislike from my private property. 3. I, as a business owner (eg: a restaurant), am allowed to deny entry to persons I dislike (eg: a previous patron who was violent) from my b…
In the US, at least, there are restrictions on 3. You can’t deny entry to black people, for example, just because you don’t like black people.
See https://www.eeoc.gov/statutes/title-vii-civil-rights-act-196....
However federal law does not prevent discriminating on other grounds. Such as political affiliation or profession. For example landlords can choose not to rent to lawyers, and every so often someone gets fired for political views.
State law may disagree. And her liquor license trick is an example of how.