The Unbearable Wearable: Google Glass is Brilliant, Loathsome and Not Inevitable (or "Take Those off before I Punch You in the Face!")

I’ve run into several friends wearing Google Glass in the past three months, and I have three words of advice for them:
Take. Them. Off.
First, you look like an idiot.
Second, you’re killing the party.
Third, are you recording me right now?!?
First Encounter: “Are You Recording Right Now?”
The first time I ran into these magical devices in the wild was at a conference. A fairly notable person walked up to me wearing them.
I asked, “How do I know if you’re recording me?”
“You don’t!” he replied before correcting himself. “Well, I wouldn’t do that without telling you.”
“But how do I know? I’m not really comfortable with trusting folks to be recording me or not. I mean, how do we have a real, honest discussion if I don’t know if you’re recording it?” I offered.
“Well, you might be able to see me turn the camera on... See, you have to click to record,” he replied.
So I’m supposed to just trust every person wearing these that they’re not recording me.