Maybe it was just your unlucky day to get someone like that on duty. When I went (with a bunch of other Canadians) we stood in line with all nationalities, including Qatari and other Gulf Arab ladies - and when someone tried to jump the queue (in a shayla and abaya) the Qatari lady who was guiding us to the various counters told her to get back into line - same thing when we stood in line for the blood test and xray.

Sorry your experience wasn't positive, but as I say, it may just have been a matter of luck (either good or bad) for both of us.
Signature line > "You can't fix stupid"