Blueloo,
You're completely correct, i find that aswell, you either get a crew which is fantastic or a crew who just can't get their act into gear and are terrible, that is with any airline, not just with QF. However, whatever the case, this CAPT was on "duty travel", no one was rude to him, the service was good by all crew and as per procedure, no dirty looks or snide remarks, he was just arrogant and for no reason, fair enough it could've been his personality i don't know, but there is no excuse to be like that to anyone. If he had a problem with the way the service was done etc, he was more than welcome to speak to the CSM later on.
At the end of the day, there is no reason to be rude, arrogant etc etc to anyone, especially on work time, there is always ways around it.
Oz