This question just came to me via vision... :P
Anyway... I just recalled a situation where my guild back in the day went from being number 3 to number 1 on the server.
Before we were always viewed by the server population as a friendly fair decently hardcore guild. But when we topped that 1st place... overnight my guild became: "that guild where everyone thinks they are so elite".
Apart from that... you also have people who think they are elite. So when is that exactly? Or is this just as vague as what the definition of being a casual is?