[possiblydrunk]

So when Google Glass came out, people using them were "Glassholes" because of the ability to record surreptitiously, albeit for a very short period. And there was no mistaking Glass. Meta's look normal and I doubt the LED indicator will draw enough attention this time around. Plus as others have noted, by the time you notice it's already too late and anyway the onus is on you to ask the wearer to stop. And this is worse, as it streams directly to social media. There should be some (legal) way to jam these devices within a certain proximity radius.

[tjpnz]

A punch in the face would work.