I wanted to get worked up about this, but I couldn't. This sort of thing happens from time to time.
Some people have brought up the post-game dancing in San Diego as an example of Patriots players showing "disrespect." There was also the time, after Super Bowl 36, that Larry Izzo, Terrell Buckley and at least one other former Dolphin sent a picture to their ex-teammates in Miami flipping off the camera, with their SB rings on their middle fingers.
Burress didn't even come close to that example. Maybe if he crossed out the Patriots championships or if a non-Giants player did that, I'd consider getting upset about it.