It would depend on the specific situation but in general...
- Casually walking by me with glasses on: No reaction, same as having a cam in public.
- Wearing them in a restaurant while I eat: Ask staff to request removal, leave if refused
- Repairman shows up at my house with glass on: Put them in the truck or get lost
- Friends/family in my house or car: VERY clear that 'not in my presence' is my preference, don't do it.
These are NOT just glasses with a camera, Google does so much more with what they see and the wearer doesn't control what is done with the data. I will never buy a pair. Scratch that, I would trash a pair even if they were a free gift.