I can only imagine how badly retailers are going to hate it. They don't want you photographing in their stores as it is with cell phones...
I wonder how long before there's a glass app (if that's what they call it) that just scans your camera input for bar codes and qr codes at all times.. As soon as it sees one, it runs the bar code through amazon to get cheaper prices for you. Yeah it already exists on the iphone.. But I'll bet they will hate it even more. I wouldn't be surprised to see more calls for cell phone jammers or RF-blocking paint.
In short, I think 99.9% of the hate will be all about the cameras. Especially if there's a workaround to turn off any indicator light that it's active.