By the time I am close enough see that puny light you've already recorded me. It's an opt out mechanism, not opt in. Maybe if there was an unobtrusive way for me to prevent recording through a wearable, like a ROBOTS.TXT file, or a universal gesture (a middle finger, or a grimace) to indicate my desire to be erased from your recording, I would consider it. I would also want some assurance that my request is honored. Given how unlikely this all is, I am simply saying "nope" today.

It's fine in situations where consent is obtained in advance; e.g., events.

I should add that I take more pictures than the average person, and used to be a street photographer, so I have been in situations where people did not want their likeness captured. Also in countries where people objected to photography altogether on the grounds that it stole their spirit. I always had to make a decision with my trigger finger, so I was able to apply human oversight. My stance is informed by experience.