The one thing I don't understand is how the terms "master" and "slave" can ever be deemed to be racist. Anyone who believes they are, is ignorant about history, especially African history.
The black lives matter campaigners are upset about how African history and the atrocities committed by the British Empire are not taught in UK schools, which I agree with: African history and the gross human rights violations of the colonial era do need to be taught in school. If you actually take just a few minutes to research the real history of Africa, you'll find is that slavery was endemic to the continent, long before the white European invasion. Black people enslaved other black people, the same as white Europeans enslaved other white people, way before the colonial era. Africa was not some peaceful, eutopian, harmonious, continent, before white people took over and ruined it. There were wars, atrocities and empires for thousands of years before European conquest.
I'm not defending my ancestors, who profited from slavery and should have known better, but no one can take the moral high-ground regarding slavery. The only reason why Europeans managed to dominate and pillage Africa was because they were technically advanced at the time. We saw a similar thing in Africa: look at how successful the technically advanced Egyptians were.
We need to eliminate racism, xenophobia and bigotry from society, but changing technical terminology will not make any difference and will only promote current misunderstandings of history and slavery.