i know what you mean about being hesitant to call someone you dont know by their nickname that youre not used to using when talking to someone. I shot a wedding a few years ago and the grooms momma's nickname was porkchop. I had the hardest time gettin used to callin her porkchop infront of all those people that was dressed in tuxedos and gowns. she insisted i call her porkchop. now when i happen to run into her in some store or something, Its "Hi Porkchop, hows it going"