I'm sorry about your view of my picture; and principally that you misunderstood that I want do The picture in this way because the embarassment I felt in that moment was not referred at the man, with I talked a lot, but at the situation he is obliged to live near the rich zone of Bologna. In this place people buy tomatoes for 20 euro and don't look at that man. In this way they don't feel embarassment... I want that they see with embarassment.
Technically a good shot, Giuliano, the exposure is just right to bring out a complete tonal range.
But....esthetically, this is an example of something I find distasteful about some street photography: It is voyeuristic and ambush-like, emphasizing the disconnection and lack of intimacy that exists between the subject and the photographer (and therefore the viewer).
The rear angle, the hidden face imply that you really don't want to see this person, or want him to see you...probably because you would both be embarassed. He has become not a person but a freak, and you have become not an observer but a voyeur, and all concerned lose their humanity.
The way to avoid this is to get up close let yourself be seen, and to look the subject in the eye and see him. A few different things can happen. One is that you both agree to continue in these roles. Another is that the scene, and the photo, are destroyed. A third is that you exchange words and come to a different understanding. Whatever the case, so be it. At the minimum, you will come away with images that appear to be freely given and taken, not stolen.
I'm not saying that any of this intimacy and engagement did or didn't happen in your photo session. But the image you have presented to us says to me that it didn't happen. Perhaps you have a better image that holds some humanity.