Ha, I got called out once for wearing my Dad's military gear while camping. I was a teenager at the time and used his gear because it was comfortable, durable, and practical for camping. The guy was insanely pissed, practically frothing at the mouth and I was just like WTF? I had no idea what to say or do so I tried to just walk away and the guy started following me while yelling about shit. I recall how insistent he was that I had fake gear (it was authentic). If there were cell phones back then I'm sure he would have been making some stupid video too. Anyway with my complete lack of reaction the guy got bored and stomped off somewhere else. I still have no idea who he was, why he was there, or what the hell his problem was.
Oh man that's so wrong...lol. This just reminded me of the time I walked in on my friend and his girlfriend. I had the same WTF? non reaction and just walked off, which ended up being hilarious to them. They were like what the hell kind of reaction was that?