I don't think there is any better word that will describe a person who will single out Amhara people and question their identity while he glosses over other by simply saying it makes sense for him. Ethnicity is fluid not a static concept. Barack Obama can be described American of Kenyan heritage or American of Irish heritage, but this does not prevent a person from listing Obama under American people of Irish decent. The same applies to Teddy Afro and others you keep on mentioning. He is mix of Amhara and Gurage, hence people may put him under different categories. Also, just because you have issue with him does not give you right to remove the entire section.