On the subject of "rude" ASIC inspectors, usually they will formally identify themselves and explain what they are doing.
I have no problem at all with ASIC checks. It is the obligation of any ASIC holder in a designated area to challenge any person without one. However, I have a massive problem with rude officials because it is completely unnecessary and only hinders the process, while alienating the vast majority of airside workers who are law abiding. I also think that entering a hangar without an escort is fraught with danger, and when one of them slips on a puddle of goo or walks into something they shouldn't it will probably turn ugly. A couple of government agencies are notorious for putting basic OH&S procedures behind gung-ho enthusiasm as Comcare knows only too well.
Judging by the original post, these people did not identify themselves, which is poor form for any government official unless they are in a uniform that readily identifies their position.