The Inconsiderate Nature of These
One of the things that I detest about the mobile phone culture is that if I am taking to someone who is standing in front of me then most of the time an incoming call will take priority. We've already, thankfully, have had a backlash from a supermarket till assistant who refused to serve someone who was talking on their mobile and not engaging with them.
I see this all the time in the local supermarket and the assistants feel quite put out by people on the phone whilst being served.
It's worse with the Uhuru style Bluetooth attachments that are placed in the year. Not only will the wearer break the immediate face-to-face conversation but the message implied by the wearer is "if I get a call then it's going to be more important than you and I won't listen to you at all"
These glasses are going to go one step further; they're saying that the wearer is going to disengage at any moment from the person in front of them without warning.
Thankfully here in the sticks we get precious few tossers with phones implanted in their ears and, as a whole, they are not accepted as a social norm by the locals. I can see these glasses being accepted even less.
Living in a city or, as it seems to be called, a metro area should be no excuse for bad manners and ill consideration for others.