As my former San Franciscan husband says, Molotov's (the bar where that fight occurred) is the kind of place where wearing the wrong thing will get you punched. Not that "She was asking for it" is EVER an excuse, but if you want to avoid aggressive people, apparently that's not the place to go. (At least that was the case approximately 4 years ago, when he lived there (and liked going to that bar).)
Anyway, I find Google Glass really obnoxious as a concept and in reality. I use public transit, and I will change cars if someone onboard is wearing them. I do not want to be on anyone's private TV show--so the same goes for people filming with their phones or cameras.
I think mbbored did the right thing. He should have respected her wishes (and should know not to stare at these sorts of things, as a rule, while wearing a recording device).
They have a red light that's supposed to be on when recording, but it seems incredibly easy to work around that feature.
This article offers a 'don't be a creep' lesson for Glass users: http://www.pcmag.com/article2/0,2817,2453616,00.asp