Big difference IMO is that the Glass is worn, and even more, is worn on the face, specifically around the eyes. Remember how douchey the bluetooth headset people were? Very small by comparison, and that was mostly hidden if you had long hair, or were viewed directly from the front. The Pebble is about the limit, which is why the wrist-computer thing is so interesting, even though it doesn't provide a huge amount of n…
Isn't this really judgmental? Doesn't this say more about you than about them?
I'm completely serious. I do not judge people on the tools they use in their life that is of no consequence to me. The same holds for Google Glass -- it is somewhat perverse, if not an attempt at group bullying, however so many try to get some sort of group disdain going about it.
The single credible complaint anyone has about Glass -- after you dig through all of the noisy subjective blather -- is the privacy angle. It may be defeatest but I think that ship has sailed, and we're absolutely surrounded by things recording us (someone mentioned lapel mics, for instance, but of course every smartphone around you might be audio recording. Video recording is often more ubiquitous, but the "pretend you're using your phone" tactic is hardly uncommon)