The correct term is "Oztranauts". They invented aviation, you know.
Having said that, the best trainer (and a true gentleman) I ever knew was an Australian. So there are exceptions to every rule. But there's also a reason for stereotypes. I don't know why the disconnect between the Croc Dundee/ surfer dude personas and the reality of supremely anal, but there it is.
Don't let the bastards get you down. Just smile, pretend that getting the wording of something, or some other pedantic non-issue, is The Most Important Thing In The World (and do get it right, of course!) and then let them carry on their silly way.
No worries, mate.
The other one, the Brits, that's just the usual former-RAF-we-had-an-empire-once compensation thing going on. More to be pitied than feared. Pay no mind.