I was in Florence and a group of older people were sitting in an outdoor cafe - 4 at the table and one taking the picture. Just behind them was a huge street with 100s of tourists walking past. They are just about on the curb.
As I walked by, I turned, smiled and waved at the camera. Never stopped, just walked past along the street but turned and faced them. I turned back and continued walking. My wife watched them and they got all kinds of angry, pointing at me all flustered as I continued walking.
TOO BAD. And pathetic that someone walking by and smiling becomes such a low point in their day.
If a photographer can't take the time to find a space clear of people, then they will get people in their shot and people are free to make faces. I'm not a paid extra in their little photographic masterpiece - its a snapshot for goodness sakes. They should take another. And another. And then a zanex. And then they should lighten up about the world owing them a perfect shot, and enjoy a funny smile or nose pick in one out of 500 pics. It isn't rude at all, it is me enjoying my time in a public place without any harm to the picture takers.
Am I a jerk? Some might say that. I, on the other hand, really enjoyed Florence.