Good subject...
There are just a few, just a few. When a performers playing do not talk      or try to go out the room, turn your phone off, and respect others.
That being said after about 30 years plying in bars,well anything is possible and if it sounds strange it probably is true.
One gig I remember when at a small club and everyone was having a good night. It was then two airborne guys walked in the door with a girl. After a very short time they started to get very loud. In the middle of a song I stopped dead and said it a very soft quite voice, "Behave your self". The airborne guys looked like a dear in the headlights and cooled down. After while they would get loud and I repeated the same thing above. So I guess you could say they were apart of the act that night.