People often stereotype based on color alone..and there are similar dynamics that've occurred in the history of the U.S. During the turn of the 20th century, those English and Germans living in NYC and Chicago hated everybody that came off the boat, and Asians too. Everybody that wasn't them. Initially, the first European immigrants that came over had to push the Native Americans out of their own land into tiny little reservations. Then, these English and German folks were hateful toward the Italians and other Southern Europeans, as well as the Irish, Scottish, Chinese, Poles, Greek, etc. What I found interesting while watching a small documentary on Greeks coming to America way back in the early 1900s was that the Greeks were bunched in with the Chinese ethnic group in Florida. And up North, they were all bunched together as dark-skinned groups - Italians and Greeks. The KKK actually was after the Greeks, too. The blacks, of course.
It took quite some time for all of these groups to acclimate to this country and the ones that had been there longest to get used to them and finally they assimilated. ..but to see the ways that people stereotyped others based on how they looked was a trip. For more, one can look up the book/work entitled
Austin Lunch. 
It's a nice story about a Greek immigrant family during the 1920s or so. Additionally, one can investigate a documentary entitled
The Journey.
Moreover, here's one link on the KKK and the Greeks:
And another...an excerpt:
They were stunned by the hate of Americans. "The scum of Europe," "depraved, brutal foreigners" they were called in print, taunted and jeered when they asked for work. In coffeehouses along the way, they heard of attacks on Greeks: the burning of Omaha's Greek Town and the routing of a gang of Greeks clearing sagebrush south of Boise, Idaho, by masked men on horses, whips and guns in their hands.8
...
