Well... I'm not sure about the religious significance of flashing your boobs for beads or drunks peeing in doorways, but I can tell you from my experience that being an asshole does not make one unique during the event.
Its not the asshole that can be annoying, its can be the flavor of asshole.
Yes, Mardi Gras is debauchery, but it has always been that way, even when the religious connotations were stronger. The gap has remained the same, the difference is the starting and ending point of the moral slide.
I'm not a Catholic so my perceptions may be skewed, but I failed to see any religious connotations at all. It was a hell of a party, I will give you. But it was about as religious as an easter egg hunt with college students trying to find miniature bottles of booze while stoned.
As to flavors of assholes, I suspect that is a matter of taste (sorry, couldn't resist). I think the guy blended right in. If anything, a little on the conservative side.