I actually spent almost five years in management at a big security provider a fews years ago. We mainly did big shopping centres, many of which became night spots in the evening with bars and restaurants etc.
Every month I had to do several 'walk the floor' days/evenings and attend site to see how things were running. I've seen loads of incidents with angry men, almost always drunk. Sometimes angry they weren't allowed back in for being too drunk. Other times having a huge argument with their partner or another make - often outside the bar but still in the shopping centre so still our responsibility.
You know which security guards were the best at talking these angry men down? Yup, you guessed it. The female guards. By a country mile.
I'm pretty sure it was because men often see other men as a challenger or feel threatened (fight or flight). In a fight it's often the guy that gets the first good punch in that wins, so you could see the men readying themselves for action if it went south. Squaring up to each other.
However, men are generally conditioned not to hit women and I definitely noticed that they'd be less likely to physically escalate when speaking with female security.