They call him one b/c he's proven that he is one. This is a moot point now.
However, thanks for that link, I finally got to see what everyone has been making noise about.
Interesting that it looks like the Pens vets make it to the handshake line first, but Crosby is dead last. I don't think it was intentional either, but it still doesn't look good at any stretch. Even if he shook the hands of no-one else, he should have at least made every effort to shake the hand of the captain of the team he just beat, interview or no. Plenty a player have cut short an interview for much less, and it would have provided even more of the hero fodder for him that the media seems to crave. It's too bad really, but nothing to lose sleep over.