Google Glass. Even without the camera controversy, wearing anything on your head is hard to pull off. Bluetooth headsets approached acceptance at one point but have gone back to serious fashion faux pas.

Or to take the other angle of it, anything remotely "feminine" is still violently opposed for the modern man at least in the U.S. Although the way I read it, umbrellas were rejected as "feminine" but weren't really allowed for women either.

Declaring yourself a conservative in online tech circles, or in Hollywood.

Folding umbrellas.