Try taking a photo of somebody with your phone. Usage will definitely look like you are snapping a picture, nobody walks around with phones straight up. The result is, when you take pics with phone, most often its obvious. When you insult people by not asking, they see it and react negatively.
When you point to people with smart glasses, nobody knows do they and that seems to be the point. Or is it beeping and blinking some led to make everybody aware? I don't think so.
Also, we live in society where smart doorbell for which it shouldn't be technically possible to upload any pics to cloud due to not having subscription still did that, and from major manufacturer. Security is a moot point, quadruple that for facebook / meta who are consistent assholes regarding breaking security and privacy to scoop any possible data points for further advertising. The slaps on wrist they receive is just cost of doing business.