Let me put it in baby steps.
Your ancestor was an Atlantic slave trader, inflicting pain, misery, displacement and dislocation to African human beings and stripped them of all humanity, turning them into livestock with pet livestock names.
Fast forward to 2018. You run for presidency and it turns out you got into Harvard by playing the 'ethnic minority' card because either (a) you heard family talk your ancestor raped African slaves, or (b) you or someone in your family noted there was African in the DNA. So, you are trophied by Harvard as its 'first man of color'.
You persist with this theme sending off recipes for Fried Buffalo Wings for the Southern Soul Cook Book, signed A Smart-Cookie (African).
Someone calls you out on your claim of being an African-American. You take a DNA test for public consumption and it turns out your DNA is >1% African.
You double down and persist in your claim, despite angry African-Americans being furious that you deign to represent them.
You fail to mention how your slave-trader ancestor made you privileged in the first place, on the backs of murdered, starved, beaten, raped kind gentle Africans who worked for free for generations and now you are claiming to be one of them.
Now you understand.
Good.