Can a vigilante be shot for bothering a man?

"bothering"?? no. assaulting? maybe

Unless the vigilante is breaking the law, no violence should be used, and violence should Only be used as a means of defense.

Yes, by an authority if they are causing imminent danger, meaning the possibility of death or serious harm. A vigilante is usually just considered a reckless person. The police would probably hit the person with a bean bag or gas them.

Vigilante's are scary. Badly scary. Will build a wall to hide behind. It's going to be huge.

If you have a weapon, you can nearly always be shot for "bothering."