Too intoxicated customer?
The security will deny anyone who is too intoxicated. It is not your job to tell people they can or cannot enter the establishment.
Aggressive customer
If a customer is acting aggressively towards you, find a security guard for assistance.
Cloths
In every restaurant/bar/nightclub, they have clothes with different colors, the color represents what the cloth is used for.
for example:
Blue - Clean zone
Red - Dirty zone