From Google's list: "If you’re worried about someone interrupting that romantic dinner at a nice restaurant with a question about Glass, just take it off and put it around the back of your neck or in your bag."

You should probably be more worried about you interrupting your own dinner. Wearing a display on your face that can distract you at inopportune moments is probably not something you want to do if you're having a romantic dinner (just as you wouldn't want to be constantly playing with a phone on the table). Your dinner partner might find it to be rude or annoying.