As for your question, you probably suspect the answer - many people will discredit Middle Easterners (including North Africans if you consider them distinct), past and present, inadvertently or not, intentionally or unintentionally. They are the modern day scapegoats, and nothing good can come from scapegoats right?
The biggest boogeyman in particular is the Arab. Muslim Egyptians, which are the vast majority of Egyptians, have a minority % of Arab ancestry. Oh God forbid, people of a shared faith but different ethnicity occasionally intermix. /s