Australian fans don't usually sing at the cricket at all, to be perfectly honest. I really don't care if they do or not, so I don't think it makes them "bad fans", and certainly they weren't quiet for four days. Did you see the ovation Ponting got for his hundred? You can actually support a team without shouting slogans for the whole test and having a 25 drink minimum. Not that there's anything wrong with that, mind.
I thought the "look at the scoreboard" chant as a response to the 340th chorus of "we are the army" for the day was pretty funny really.