Well I certainly can see why you would say that, but personally I want to give Naruto a little more credit than that and just say that he's grown as a person and has learned to be in better control of his emotions.
So when he saw that kunai, he knew immediately it was his dad, and rather than get all sentimental, he decided to act like a stud (he does have lady over his shoulder at the moment you know)
With a cool father like Minato, I can see him trying to keep his cool about his dad's epic arrival *throws shades on*