"Oi!" And she's back, tricking him again. He's really not expecting that, with the way this encounter's been going and now he's scowling at her, indignant.

"Isn't like I didn't try! And where do you get off all high and mighty-- you didn't fail, hmm? You found the wrong Doctor, Rose. Yeah, you did a right bang up job!"

Okay, so now he's less angst and more petty bickering, without even realizing what she's doing.