Could well be true, although as time goes on you have less and less interaction with real humans in the Aus airports. Its all self-serve biometric scanners, and you only see a real person when the scanner refuses to accept the passport. But the queue managers who are the only BF staff most people see do seem to be the shouty ones.
My last Zim passport had barely perceptible (by eye) printing error in that the left hand side of a zero in the biometric number was printed marginally thicker than the right. Unfortunately when run through the Australian scanners, this digit would be scanned as a "1" 9 times out of 10, and then the check-sum algorithms would flag a data inconsistency. So I would first get called up by the duty officer, and then get accompanied to the forensic focussed office, with the magnifiers, super duper scanners and other CSI paraphernalia to be checked out. Luckily the first time this happened I was carrying a whole ID file with me, so had reams of old passports going back to childhood, birth certs etc. so I was able to convince them I wasn't a forger, together with all my bank cards, drivers license etc. Learnt that these secondary ID was essential back-ups to be carried on international flights! Long story short, these interactions were always pleasant enough, and it was just a delay to allow for in layover planning.
The TSA in the US have staff that really span the spectrum from amazingly friendly/tolerant to those with pent up aggression that is just searching for an excuse for an outlet. Never make the first joke with a TSA person.