This is for self-defense. Not that I live in a country where they (officially) ship, but just in case…
Regarding “how to tell them apart from regular glasses”, this question is mainly about Ray-Ban Blayzer Optics:
Ray-Ban Scriber Optics:
And Ray-Ban Display:
Because these are by far the hardest to identify. Other glasses either have a clearly visible “RayBan” text in the top left corner (which for the pictured ones isn’t clearly visible) or can be identified just by their style.
Most legal systems will require you to prove that the other person had ability, opportunity and intent to cause you actual physical harm, and that you used minimal, necessary and proportional force. Someone recording you in public doesn’t get you anywhere near that.
Assuming we’re operating at legal level here, not at ethical level. Which is a factor everyone decides for themselves.