Racism is a worldwide matter that is based on the physical characteristics of people's division into different categories on which some people become superior and some inferior. Racism and ethnicity are usually considered as the same concepts while in fact ethnicity is a sub-class of racism. In every nation, there are some ethnic groups with the same origin and similar customs that may or may not be judged equally by the power-handler ethnic groups. An example of such country is Afghanistan which is severely an ethnic country. This study explores the social, cultural, and scientific investigations done on the people's races and ethnical characteristics by using Afghan types as examples. Racism is not the result of scientific observation, but it is due to the human differences that happened between 16th and 19th century when people began differentiating among themselves. This aspect of racism is well expressed by the American sociologist "Feagin". In his view, the natural superiority of some people over others is rejected. The novel The Kite Runner depicts the two major Afghan ethnical populations, Pashtun and Hazara, and their social, cultural, and religious conflicts. Accordingly, this article will try to examine the root of ethnic prejudices and oppression among the Afghan people in the novel and the reasons for their ethnic conducts are explained and analyzed based on the Feagin’s denial of human difference. Moreover, by providing some evidence it is proved that the biological difference is just some excuses for the powerful section to gain their egotistic goals.