Welcome aboard. I'm trying to be better with people but cameras are very intrusive and I hate to push my needs (for images) into someone's private world. Yes, people have a private world, even when they're on the street. I try to be respectful of this and I suspect the difficulty is as much mine as their tension. I do think I'm getting better at this.
Interestingly, I've been in several situations where people have been taking pictures with P&Ses and phones and it's all OK. But when I lift up a battered black F they seem to think the game has changed. As if images from my camera will end up on a magazine cover, whereas in reality it's the phone images can be on facebook, and in a minute too. I've seen this even amongst those too young to have known the heyday of Life, and The Post. The world of La Dolce Vita and paparazzi on Vespas.
By the way, I'm headed to Krakow in a few weeks. Any tips on behavior so I don't get punched?