Honestly, he half expected the Master to flat-out not take him seriously. He doesn't need other people boosting his specialness and ego to be convinced unflinchingly of his own greatness and future accomplishments, and others underestimating him seems like it would make the dying look on their faces all the more entertaining.

But insulted?

Good enough, Caliborn guesses.

"That's a weird reaction, but okay, bro. Why the hell not."