I think you need to lay off the coffee for a while. Talking w/ interested parties is part of the fun (not all people are interested, they're often pi**ed if they're in the shots), and who cares if someone takes photos where you did? As a film shooter, I'm used to being pointedly ignored as the old duff who can't even afford a digital camera (I've seen people actually shake their head and walk away when they see it's a film camera), so anyone who is actually interested is a treat for me.