"Not all doormen are 'nasty nutters'."

Yeah, I know one very laid back chap who works on doors.
Came off the same council estate as me. Nothing nasty about him, he was just into - and good at - martial arts from a kid.

To be honest, many of the lads I knew in my old area were 'into' "violence", in the sense of taking knives/numb chucks/knuckle dusters etc. to school back when they were pretty young - including him. It was just a boy thing! But he wasn't violent then, and still isn't now.

He learned self-discipline from his martial arts training. Now he has to deal with those who weren't as genuinely interested in combat sports as him - and consequently haven't developed the same kinds of self-discipline which make him able to safely manage such drunken fools when they're busy trying to provoke him into fighting them..