On the contrary, she doesn't look offended, she looks pleased, like he's passed some sort of test he didn't know she was giving him.

She reaches in and taps the tip of her nose with her finger, smiling at him. "And that's why I want you." Because he seems to understand what she's getting at, and even though he clearly would rather avoid the whole song-and-dance routine, he's willing to do it. For her.