I think the parent's point is that the technology to secretly record people already exists, but people treat Glass as if it's the sole means by which to do such thing. And even when they do recognize other forms of secret recordings, they give them a pass while simultaneously condemning Glass. There's a huge double standard.

Case in point: Remember that Seattle restaurant that famously argued (via Facebook) with a diner it ejected for wearing Glass? That same restaurant had numerous photos of random customers posted to its Facebook page, many of which were taken without the subjects' knowledge, let alone permission.