no they just dont fuck around with BS fighting rules. if you're going to fight, you fight. Fight doesnt mean box, fight doesnt mean an irish ho down. Fighting means you punch when necessary, bite when necessary, rip when necessary, use objects around you when necessary, break bones, twist arms, choke, tear ligaments, anything and everything it takes to as quickly and effectively as possible cause harm to and/or disable an opponent.
When i was a kid I would do the whole "meet me in the parking lot" routine, got our friends together, took off shirts and glasses, threw up our hands and just boxed each other. I learned that shit is a waste of time. not only does it attract attention, leave you vulnerable, and not to mention legally liable - you WENT to the fight, something you could have avoided, instead of reacting to a threat on the spot which is something potentially unavoidable. The parking lot thing meant that on many occasions i was responsible for paying multiple thousand dollar hospital bills - i knew i could kick his ass (or get my own kicked), and i went anyway just to prove something i already know which hurt myself someone in the process. When i punch someone on the spot, I'm reacting to a threat and the outcome is uncertain.
also, when you let a fight get to the who square-up fists in the air point, more damage tends to occur. I usually have to resort to breaking one of their bones to get them to stop punching. When i take care of something on the spot, that single knockdown haymaker "suckerpunch", or armbar/submission, delivers the message loud and clear with no bullshit. you should learn to do likewise. someone hits on your girlfriend at the bar, then tells you to back off "his" [your] woman, whack him upside the head as hard as possible. No need for parking lot bullshit. If you have a repore with the bouncers, you shouldn't have a problem. this will also prevent him from getting his buddies and their guns or tire irons in time before you put the fear of god into him.