While the bar is a noncommercial setting to tell stories, it's hardly a private one. The analogy seems to suggest that the distinguishing feature that triggers the more is on one side commercialism and on the other side publicness, but then it doesn't quite keep it consistent. So I guess I don't quite get it: why, under this reasoning, is it OK for him to tell the story about you at the bar?
Not at the moment of the conversation, but there's nothing stopping one of the people there from blogging about it once they get home (think Silicon Valley "overheard" product leaks).
The fact that a piece of information passes through a volatile medium before ending up in a more permanent form doesn't change the value or ownership of the information.
On a tangent, Google Glass passive audio and video recordings will be much more damaging to one's privacy than photos shared intentionally by friends.
