Aussie Bob was the gentleman concerned an ARO or a security guard.
I am interested because I have found almost all ARO's to be very pleasant and easy to work with. They are generally interested in all things aviation and are knowledgeable about their airport and it's workings.
Some security guards, on the other hand, are often aggressive and overly officious. I have to say that many of them are professional and pleasant to deal with. However when you get a difficult security person it can get out of hand very quickly.
My advice would be to lodge a formal complaint if you really think this person was unreasonable.
Security guards, like coppers, have a very important and often difficult job, however I do not think that we have to accept unreasonable behaviour from them.