People challenge my nerd cred all the time. I just show them the photo of me winning my middle-school science fair wearing my Casio calculator watch and eyeglasses so big they look like they can see the future.
Undeserved praise causes more pangs of conscience later than undeserved blame but probably only for this reason that our power of judgment are more completely exposed by being over praised than by being unjustly underestimated.