Yes, I'm a technician by trade and the sh**d*cks who stand behind me saying "watcha doing?" "what kind of wire is that?" "did you have to go to school to learn that?" I don't look at them, grunt my answers and they usually get the hint when I abrubtly leave "to get something out of my truck". Asking a couple of questions is fine but chatting someone up when it's obvious that they are trying to work is just rude.