i'm a local and those actions makes me feel shameful, i have studied and lived for a while abroad and the only thing i found was hospitality and appreciation of my humanity.
first suggestion is to take this incident and others all the way up to human rights comittee here in Qatar , or to your embassy and let them know that their citizins are being treated on racial basis,and declined entrance to public places.
second thing i wonder what would happed if Qataries were treated the same during their vaccations in europe and were forbidden entrance to a certain mall just because of their race,
this is total racism and pure discrimnation .
Stupidity has no limits