Australians are probably the worst, I've kicked of more Aussie's in the last 12 months than I ever did whilst in the U.K for 10 years. It's not just the drinking either, usually smoking and a new trend is mid flight fights.
Why don't airlines chase these clowns for costs? Had a idiot the other week who was on the verge of being kicked off, I reminded him that should I return back to the airport engineering will pass the bill on for overweight landing damage. He never said another word all flight.