Habesha and Somali people are indiginous to the African continent. By this I mean you could always tell the Arabs in North Africa 'go back to the Arabian peninsula', White people, 'go back to Europe' and Indians/South Asians 'go back to India, or whatever South Asian country you immigrated from', they can trace their roots and cultures back to those places but Habesha and Somali people have nowhere to go outside of Ethiopia/Eritrea/Somalia/Djibouti, they have Arab ancestry and a long history with the Arabian peninsula but they are not Arabs or of (primarily) Arab descent. Some mistaken and confused ones may not identify themselves with the rest of Black Africa or as African or Black( they are), but they're not and I don't think you'll find any who consider themselves , Arabs, maybe a people unto themselves distinct from the Arab world and the rest of Black Africa, but not just Arabs. Arabs speak Arabic. Somali, Tigryna, Amharic etc. are indiginous to the African continent. As far as I know, Somali's displaced the Galla in Somalia who pushed down south the indiginous Bantu speaking Africans, but Ethiopians ( except for their Arab ancestors ) didn't come or migrate from anywhere else outside of Ethiopia.
'Adoon' is a deragatory Somali word for bantu speaking Africans which means 'slave', and slavery and genocide are a part of the Bantu Somali plight, like Rwanda's 1994 Hutu/Tutsi genocide or Nigeria's 1967-1970 Biafran civil war, the hateful individuals responsible need to be castrated, tortured and murdered, but as for the different groups or 'tribes' , they're both Africans. Since Habesha and Somali people are indiginous Africans, you can't talk about African unity or the Black African family, whether they deny being Black Africans or not, and not include them. Just like many American and Caribbean Black people as well as Black Latino's deny being of African descent or the same race as Africans, you can't talk about pan-African unity without including all people of African descent.