I disagree on the comparison, tbh. Headphones is a purely personal experience; when you see it, you know that person is enjoying some private time, isolating himself from the busy / noisy outside world, or just being a douche. They don't cause uproar because, even if they look silly or make you look silly or like an audiophile (depending on make and model), it's something they do for themselves.
Wearing Glass, on the other hand, is pretty much saying "I AM GOING TO RECORD ALL THE THINGS!". Actually, nevermind; if Glass did not have a camera but was just a heads-up display of sorts, nobody would care. All of the controversy surrounding Glass is about the camera, not about what the original concept was, a heads-up display.
tl;dr: the comparison makes if Glass was just a heads-up display for personal information purposes, but it doesn't because it has a camera.
Wearing Glass, on the other hand, is pretty much saying "I AM GOING TO RECORD ALL THE THINGS!". Actually, nevermind; if Glass did not have a camera but was just a heads-up display of sorts, nobody would care. All of the controversy surrounding Glass is about the camera, not about what the original concept was, a heads-up display.
tl;dr: the comparison makes if Glass was just a heads-up display for personal information purposes, but it doesn't because it has a camera.
Picture headphones with a camera.