I think he's expressing his First Amendment right to free speech.
If it's not a crime to burn, stomp on, and otherwise desecrate the American flag, I don't know why it would be a crime to burn the NJ state flag on a backyard grill.
This man is outraged that the country is expressing its "grief" in the form of political, senseless, bullshit "fly the flag at half-staff" that by itself means nothing when it's done at the memory of a celebrity, I have the sense that he's equally incensed at that practice as he is how the country reacts to those who have gone in harm's way and have come home in a box -- or not at all.
He's pissed off at the entire country for putting up with this nonsense and he's taking it out on NJ. Christie actually has the temerity of defending his actions, calling Houston "a cultural icon." That's one of the problems we have in this country -- putting more and more value on "cultural icons" than the common man and woman who serve and give their all.