Absolutely. Any time a Non-BCS team loses to a BCS team it perpetuates a stereotype that non-BCS teams cannot compete with BCS teams, regardless of who they are.
That being said, I could not live in a world (its just a metaphor, I am not suicidal) where Hawaii claimed the WAC was better than the MWC, had bragging rights over BYU for busting the BCS, and beat a highly ranked SEC team. Sorry, but I want BYU to be the first to do that, and to do it consistently (I know Boise State did it once already--Stupid Boise State).
Call it immature, cutting off your nose to spite your face, or whatever. But it is what it is.