"But she is not Egyptian, maybe American"

Today I went to Starbucks to get my coffee in the morning.
I was still half asleep and my brain was not as active as it should be.
As I give the guy my card to pay for it I ask him to make sure he charges me only once. I tell him that last time they charged me 3 times for the coffee. (Yes, I paid 60 LE for the last coffee.. painful!)
I hate the fact that I need to remind the place to only charge me once... anyway.
Since I am still asleep I cannot even think enough to formulate sentences in Arabic. So I am talking in English.
After I tell the barista man to charge me once he walks to the man in the dress shirt.. (the important guy). I hear him telling him about being charged more than once.. and the he tells him "but she is not Egyptian, maybe American"
Then Mr. Barista Man comes over and tells me that Starbucks is sorry that I was overcharged and that this coffee is on the house.
I don't know if I am being fair.. but I think the free coffee had more to do with the fact that I am not Egyptian than the fact that I was charged 3 times for my last coffee.
If I were completely Egyptian would I have gotten a free coffee? Would they have trusted me about that? Or would they have thought that "the Egyptian" was trying to get free coffee....?
How can the people be so predijuiced towards the nationals of the country? How can they be racist against themselves?
I used to love this... I used to love being trusted, respected, listened to because I am American... but now it only saddens me more about this country.
Is this the result of Egyptians not being trustworthy and trying to scam anyone... or are Egyptians no-longer trustworthy and trying to scam anyone because of how they are treated in their own country.

Note:
I apologize to all the trustworthy Egyptians out there.. I know you exist.. I just have not been running into you for awhile... please tell me where you hold your weekly meetings because I really need to see the good side of Egypt and deal with the good, normal Egyptians....