It's the idea that the person sitting there working on a mac must be creative b/c he has the good taste to own a mac, the machine of choice of graphic designers, marketers, and other creative types.
See, maybe it's where I hail from (New Jersey), but I've never seen the mindset that Apple = creative. Me and other Mac users talk a lot about our Macs because a lot of us are just finding out how to do stuff, and if somebody else brings up the stereotype of artsy-fartsy we jump into character... but I haven't seen anybody walking around with this "I own a Mac" self-importance. There's a lot of "Boy am I glad I have a Mac" mentality, but that's about it.
Actually, the most pretentious lad I know uses a Windows because he's too artsy to use something that's accepted by the artistic majority.
