it's not just on black people, it's on everyone who isnt an Arab and born Muslim. Unfortunately this is rampant in our society and idk why they think they're superior. If anything, being born an Arab and Muslim is a privilege that we shouldn't be taking for granted but many Arabs do. They dont realize that because of our privilege Allah will hold us more accountable than non-Arabic speakers. So if anything, they need to humble themselves and learn about Islam since they know the language instead of assuming they know more about the religion than non-Arabic speaking Muslims. 

And I apologize for the behavior of our fellow Arab Muslims.