The people of Rosario are wonderful. Never have I had a problem for taking their picture. Very few look unpleased and most will simply laugh about it. Quite an example for the grumpy people of too many Western cities. (click on picture to enlarge)
Leica M9 with 60mm Hexanon at F1.4, 1/2000, ISO200
Leica M9 with 35mm Summilux Asph at F1.4, 1/2000, ISO200