Question: I'm trying to write a letter to the editor of my local paper about their report of a man who doesn't think the rules apply to him. Is there a word for this? He's a bit of an egoist, demanding to speak at city council meetings after the public hearing portion of the meeting has been closed.

Answer: 
scofflaw : –noun
1.
a person who flouts the law, especially one who fails to pay fines owed.
2.
a person who flouts rules, conventions, or accepted practices.

<http://dictionary.reference.com/browse/scofflaw>
How about *Rebel*? Rebels resist convention.