I've always figured if all you did was fly ARFs you were a "rc plane flyer", a "model airplane flyer", not a modeler. A airplane modeler is someone who "models" airplanes. Any definition of "model" or "modeler" involves creating, building. I think it would be stretch to say "I model the flight characteristics of a real airplane when I fly my ARF, therefore I am a modeler." Not that I really care, someone can call himself whatever he wants.