One polarizing behaviour both communities employ is name-calling, which includes “booty-scratcher” to describe Africans and “Akata” to describe African-Americans. There is a sense that both groups use slurs to identify each other, when these prejudices are inherited from slavery and colonial times in which black people were disrespected by being called names
. More:
http://theafricachannel.com/new-doc-tackles-division-between-blacks-in-u-s/