I am highly opposed to these glasses, but there's nothing you can do about it in public besides swearing at these people and not being friends with them.

Sometimes I have wished I had a handheld EMP gun for such situations. What are they going to do? It would be harmless to living beings and leave no trace. Their device would simply stop working suddenly.

1. I am sympathetic to the notion, in fictional settings.

2. Real world pacemakers, deep brain stimulators, infusion pumps, cochlear implants, etc. may be less tolerant of it.

That's still common assault.

Actually, that's battery. The assault is by the person recording without consent.

How is filming someone causing physical contact or harm, or putting someone in apprehension of physical harm?

Gives a whole new meaning to the term spyware.

Spywear

I'm stealing this, thanks.