"Dynamic" is fine, but I think the answer for violence is no, at least not without a threat present. If the accused wants to mount a case that this was a case of "fighting words", but in the legal definition, he can try. In the legal definition, the application of "fighting words" has been restricted to verbal activity that makes a reasonable person believe that an attack is imminent. If he can claim that he felt the 77 year old dude was going to punch him, and his punch was just preemptive self defense, then he's got a case.
I think in my youth violence on the level of a punch or a fistfight was more tolerated, but today, I think the answer is that it is never acceptable without self defense, and I think the world is a better place because of the change.