Yes, that can be a Major problem. I worked at one place Cooking and every Friday night the same two dipsticks (friends until they drank too much) would get into it at the Bar.
The stupid owner would call the Cops. Fine and Dandy except in Texas that means the PD sends a report to the TABC, too many of those and they will pull your Liquor License.
I took over the breaking up by coming out of the Kitchen with a 4 quart sauce pan of smoking Fryer Grease and telling them they had 2 choices:
1) Take it outside.
2) Go to the ER.
They created a 3rd option themselves by immediately apologizing and shutting up.
bars around here try to avoid calling the cops at all costs short of a small riot and like you, deal with it inhouse whenever possible