Since we’re apparently letting anecdotes pass for evidence, I’ll throw in my 2 cents.
In my youth, I didn’t go to many bars. I’d been to dance clubs a few times, but don’t drink myself.
Got a little older, hanging out with friends, started going a few places.
One group of us went to downtown Houston for a promotional event, big dance club. While we were approaching the front door, I watched a black guy and his two buddies walking out of the bar, and a white guy and his buddies sucker punched him in the face. He started making noise to draw attention, but nobody wanted to wade into that mess, and the two groups started a scuffle. This is with a line of patrons waiting to go in trying not to get stepped on. I took a look, decided I didn’t know who had said what to whom inside or what it all was about, so I kinda directed my friends back and we stayed out of trouble. I think the bouncers came out, some people took some hits, and it kinda winded down. Me and my friends went inside to our event. My evaluation of the scuffle - some punches exchanged, some grabs and fall to the pavement. No real grappling skill, no punch combos or real technique.
Another time, I was hanging out in a strip club, I watched a couple of drunk cowboys start sizing up and the bar staff come over to move them outside.
Another time, another strip club (this one fairly crowded), I was watching a dancer having a talk with a guy and she slapped him in the face. I was afraid the customer was going to respond poorly to that, but before he could do much, someone jumped him from behind into a choke hold and they stumbled past/over me toward the door. No riot broke out.
Another situation, another strip club, I noticed a drunk guy giving me the eye and kinda making provocative motions at me. I ignored him and he moved on.
In 10 years, that’s maybe 4 events that happened around me.
There are a couple other events that didn’t happen in bars that involved someone else getting testy and potentially provocative, but I ignored them rather than feeling the need to “stand up for myself”. They went away and claimed victory, I got to go my way in peace and not deal with an asshole.
My brother in law worked as a bouncer, and has broken up some fights. He also studied judo and jujitsu, and used choke outs.