[andrew2527]

Bars can ask people to leave who are simply loitering. They should not slam their heads against a door.

The proper thing to do if the patron will not leave would be to call the police.

[wideawake]

Correct. But this individual was apparently not loitering, but was part of a larger party that was buying drinks.

It puts me in my mind of the time that I went out to dinner with some work colleagues accompanied by a Jewish colleague who kept strict kosher. He ordered nothing, while the rest of us had a meal.

Imagine how bizarre it would have been if the restaurant's manager had said - "if he doesn't order anything I want him out of here!"