I don't attack Open Source, or extending your body, or nifty Android gadgets or whatever. That's all fine. But I do not accept being recorded in a bar. Can you understand that this is not some sort of crazy reactionary idea?
And that’s just for picture taking. For recording (either video or sound), you need to put up signs on private property and you are not allowed to constantly record public places anyways.
So, yes, you can have an expectation of privacy in any public place in the meaning of not being covertly recorded and photographed.
As for expectations, nobody in any society where Glass is useful can claim to have an expectation of not being photographed in public. Google Glass relies on the availability of Internet access, which basically means a society where cell phones are common, and by extension cameras. People use cell phone cameras in a casual, carefree manner in public and private; Google Glass is no different.
Might we need a different standard?
There are already other classes of always-on video recorders that people generally accept: dashcams, security cameras, etc. There are a few complaints from people who do not think wearing a mask in public is an acceptable countermeasure, but for the most part people do not mind -- as long as the camera is not pointed into their home. Google Glass is hardly different; in fact, it records video less often.
While I like the privacy and even worked on software which will help protect it, I'm in favor of the right to film in public spaces, this way we as society can highlight bad things without being afraid of charges just for filming.
I don't know the last time I saw a security camera at a bar. At any rate, security cameras are not at every table. And it would not be accepted to upload footage from the security cameras to Facebook and tag me in the footage.
The people running a bar have no interest in messing with their security system unless there is a major incident, and they have an active commercial interest in not exposing all their customers (or blackmailing them for making an off-color joke, etc.) as this would tend to inhibit repeat business.
I have no worries about the owner of a bar sharing surveillance footage of me with the FBI. The FBI is relatively restrained, under a certain amount of supervision and legal constraint, and not interested in my off-color jokes. These things really don't apply to private individuals.
You say you want to "highlight bad things" but maybe you are Adria Richards. I have no idea what you think are bad things. There is no upside for me in every second out of the bathroom being uploaded to Facebook.
Taking video of me at a bar against my consent is not a right. That's just something you want to do.
At least security camera tapes are usually for that purpose and footage isn't live streamed to social media websites.
The killer with glass is that it is a survelliance device under the guise of an innocent device.
The real change is that it may become socially acceptable to wear a recording device.
Just like I choose bars that don't allow smoking.