Oh, I get it.

(1) chillsm00th is proposing that "A-rab" is the normal Midwestern pronunciation of A-R-A-B.
(2) chillsm00th is from the Midwest
(3) chillsm00th has heard people refer disparagingly to people of Middle Eastern descent.
(4) therefore, when chillsm00th has heard people refer disparagingly to people of Middle Eastern descent, he has heard them called "A-rabs."
(5) thus, he should recognize that "A-rab" is a racial slur.

I suppose that's logical enough. Except, replace "A-rab" with "Saudi." Or "Iraqi." Or with "Chinese." Or "Korean." Or "Indian." You're to tell me that calling a Chinese person Chinese is a racial slur? That's preposterous on its face.