Can you be anonymous & really call someone a punk?

ESPN Boston
ESPN the Magazine features a recurring series called 'Player X' in which an anonymous star dishes about the league. In his fourth post of the current series, an anonymous NBA star takes a big swing at Kevin Garnett while writing on trash talk in the NBA.

From the Player X blog:

Garnett is a punk and a coward. I know, I know. Easy for me to say behind this column. Don't worry, I'll tell him to his face, too. And I'm not the only one who thinks that: If you're not on his team, chances are you hate the guy. You can learn a lot about him by watching his eyes. If he's talking to you -- and he's always talking -- he avoids eye contact. My advice to other guys in the league: Stare him down, and he'll retreat. From what I've seen, he'll never mix it up with a player who's bigger than he is. Personally, I think he's scared to fight -- like a playground bully who barks but doesn't bite.
I basically gave my opinion on this in the post title, so stfu Channing Frye. What's your opinion?