No, I'm just interested if his behavior is significantly different from those around him that are ignorant. Because for me, it's not. And if that's true in the general case,
> The only chance ... combat the public ignorance ...
is false.
> Running away
is not the same as ignoring. Also, one can hardly express one's disapproval if one is indifferent.
> ... I would give the guy fair warning, then rush him for being predatory.
If I were the guy, I'd make sure to charge you with as many crimes as I could. Just because you announce your intention to beat up an annoying jerk before you actually beat them up doesn't make it acceptable behavior.