If I didn't offer myself up to be challenged, then I would see a problem with my logic. If I offer anybody to challenge my claims in a game, I don't see what the problem is. Imperial Guard isn't based on humility or lack-thereof; it's matter of fact.
oh, slight qualifier:
it's not myself I'm glorifying here; it is the Imperial Guard codex as the most ridiculously IMBA, broken, and unbeatable book when taken objectively (that is, outside of player competence and luck).