Stop with that dumb Black people can't be racist bullshit. Even if you want to play the semantics game where you use a cherry picked definition of racism that requires the racist party to have a power advantage over the abused party, that wouldn't apply here. Blacks have the power in Nigeria, so they are actually in the position to be racist by even the strictest definition. And what they are doing is textbook racism, period. You know that. It might be racism in response to racism, but it's still racism.
When blacks were wildin' out in Paris a few years ago, what would you have said if white people here started destroying black businesses in response? You would not have been like "oh, well that's fair." No, you would have correctly commented on how stupid and racist it was for white people in the US to attack blacks in the US over some white property damage in France caused by blacks in France.