I really don't mind (much) the photo thing.
Sometimes it annoys me when done on the sly (in a bar or while eating would count as that), but much prefer the on-lookers to have the manners and balls to ask me. Then, I will do it - with the daft pose (because they love that kind of thing in China).
For a moment you can make someone very happy just by looking into their lens. If only life was full of these free and simple moments.