I agree with C_A. Clark was always making smart remarks in the series. Like in the Prankster when she stays at his apartment and the next morning they are going to go on an interview and she asks if she can go home and change clothes (I think she's in sweats and her hair is in a pony tail, obviously she needs to change first) and Clark says yes that he knows how you senior journalists have an image to maintain. He says it in a smart alec tone.
He was geniuinely concerned about her the night before. We had that sweet little couch scene with them, and then the next morning he was being smart with her. That's just part of Clark. His funny/ornery little quips.
