That's because you downthread hazarded the argument that perhaps (compared, implicitly, to Africans on the African continent) African Americans were better off as a result of slavery.
That's a reprehensible argument, but at least it puts you on the hook for points like these.
This is simple reasoning; nothing reprehensible here. However, it would be reprehensible if I used this one positive outcome to justify slavery, which I’m very clearly not doing. Slavery is bad even if it did have a positive outcome.
Of course, none of this “puts me on the hook” for other other unrelated arguments, nor do they make Haitian slavery relevant to the subject of US reparations.
What is ridiculous is you trying to detract from this history by pointing to an Africa that has _also_ been obviously and inarguably harmed by imperialism. It is absolutely indefensible.