The TARDIS didn't just listen to all his tirades only to get offended by his rather forceful disbelief now. He did say thanks, and his tone isn't particularly unfriendly either, like this is simply how he talks all the time. Besides, considering his circumstances, being overwrought is still to be expected. She thinks she might be starting to get the hang of dealing with this peculiar child.

"I'm called the TARDIS, I am a time and space ship. And I was not being facetious," she corrects him gently. "The Doctor - my pilot - and I have saved our universe from threats of that magnitude several times." But the point is a bit moot, since they can't actually help him with his troubles anyway. "And what is your name?"