I shall maintain the correct answer to this is it's legally permissible to correct any camera that is recording you without express consent. If that camera happens to be on someone's face at the time... They should have made smarter life choices.

It’s not illegal to take pictures of people in public. I get that it’s creepy, but where does one draw the line?

Most countries have mastered this nearly impossible task of drawing the line quite well.

In many everyday situations, yes - it may be legal to take a photo of someone in public.

Australia doesn’t have one single “photography law” that bans taking photos of people in public. Instead, the legal risk tends to come from a mix of areas, like:

• privacy and surveillance laws (which can vary significantly by state/territory, and can apply even when you’re not “hiding” what you’re doing)
• consent and image releases (particularly for commercial/promotional use)
• workplace surveillance rules (if staff are involved)
• australian consumer law risks (for example, misleading or deceptive conduct if an image implies endorsement)
• defamation and reputational harm
• harassment and related conduct
• where the photo was taken (public place vs private property)

(source)

It's very similar in my home countries.