Btrbill when did you apply? The airports you worked at are as respected as you can get. If you applied within the last few years, your snubbing may well have be due to an individual who no longer works here.
If it was quite a few years ago, well things may have changed as we have a few South Africans now and they are certainly proving that person to have been wrong as they are very welcomed and doing a good job.
Doha has progressed as we now don't just have one but many reasons to leave.