Why Do ppl find it hard to accept the term African American?

The term is simple, Race and Nationality.E.g It means if you bare racial features of the ppls of Asia and live in America, that means you are a Asian American. I took up genetics also. It is easy to say something like AA are mixed. Well technical(which I despise the word) we all are mixed all women can trace their mitochondrial dna back to Africa.All humans come from Africans so, technically we all are Africans. Keep it simply if you look African you are. Also, African dna dominates European. That's why we look like African. If you look like a women maybe you are a women. If you look like a African maybe you are. And their (technically)is no such thing as a white or black person. Africans are verges of brown, from dark(which is called black) to lite skin. Europeans also range in skin tone. Just like Asians. You don't call Asians colored or yellow or red or yellow brown etc.Also, in America would you go up and call someone" a colored boy"? In the 1800's it was monkey, then boy, then colored, then ******, now black, black is a color its the same thing. But go to any dna testing site or browse the web all life started from Ethiopia. Matter of fact go to National Geographic web page. All races descend from Africans.