Although I generally strive to always be polite and mind my own business (unless I perceive there's physical danger to someone), and I'm ALL about telling some busy-body what they can go to themselves in a dark closet full of paper towels, I'm not down with a beat down on anyone unless they're in your immediate personal space and attempting intimidation or threat of physical force.
Too bad she didn't choose someone with your temperament to accost about a mask. You're WAY smarter than the guy she did choose to chastise! A bunch of loose cannons around these days.