Your friend seems to be paraphrasing William Gibson:

Those astronauts in the International Space Station are damned then.

Exactly!

And I never ONCE disputed those FACTS (though I do question the notion that all of Africa betrayed all who were forced into slavery and their descendants). What I do dispute is the idea that Africans have a responsibility to black Americans which black Americans do not also owe Africa and Africans in turn. I do…

OK, let’s clear this up real quick. Black Americans are the only population that never wanted to go to America. Africa betrayed them and we should rightfully feel a deep sense of shame. Secondly, black Americans have a valid claim to African heritage since they elaborated on “our” culture in the New World and in turn…

Convenient. According to your original logic, that statement does not apply both ways.

I think black Americans and black W. Indians should be more suspicious of other people of colour who claim to be allies by virtue of their skin tone. This includes populations from S. Asia and Africa who often play dress up with black American and W. Indian culture when it suits them and discard it when it doesn't.