I get that to an extent, even though I am white and ethnically half English, half French. People at work know that I was born and raised in the middle east, and know loads about the area and Islam as a result. I have been called Osama 'Bridg-maden' (my real name is Ryan Bridgman) since Sept 11th, and I always get jokes like 'Ryan, it's the FBI on the phone for you', or, 'Ryan, if we don't close this deal I'll tell them you're going to put a fatwa on them!'.
Thing is, it's only harmless joking, so I don't mind. I can understand that if you are ethnically from that area it must really piss you off, but that's ignorant people I'm afraid.
I used to think the brain is the most fascinating part of my body. But, hey, who is telling me that?