Maybe if they're cavemen. So because they're fighters, in an mma gym, they should solve their "beef" through fighting. That's a pretty simple-minded approach. Let's assume these two are grown adults and the wheel has already been invented...
You can be a martial artist while also being mature and disciplined. Discipline over one's mind, body, and emotions are better indicators of being a man than being some hot headed punk that wants to solve their problems through fighting. Fighting isn't always physical. Punks fight when they can. Real men fight only when they have to. Sean was the better man in this case because he got control of his anger, showed discipline/maturity to leave and not escalate things further. He is a business man. If he fights Sanchez, he will get paid and KO this bitch on stage in front of thousands. Not in some crappy gym with camera phones for free. Time to think like an educated professional and not a amateur punk.