Sarcastic or not it wouldn't matter if Portis did this or not more than once. As long as he's willing to dress up and play characters, and be funny, with the media they're always going to love him.
Chris Cooley is another example. Cause he's a goof ball, and the media sort of likes him, he gets ripped for posting pictures of his manhood online for about a day. If TO did this then this would be something to rip on him for absolutely every chance they get.
Another great example would the the Giants. While they were destructive, and devisive, as a team, calling out their coach, they got some pub on it and got ripped a little but the moment they won the media turned this into something about how the Giants needed to vent like that and get it turned around. Now Coughlin is praised as a coach who changes his ways, his team that ripped on him are just fine and they just pretty much try and say "It was really only Barber and Shockey anyway". Let that EXACT same thing happen in Dallas, with TO as part of the players making those complaints, and even if they won the Superbowl after that the talking heads would talk about how they got lucky and won it INSPITE OF TO.
It is what it is. Doesn't matter and who cares.