"BTW, I have also read claims by Indians and Chinese that they invented algebra, etc. Is that barfy?"
I would consider any lie passed off as history "barfy".
"What is it about Afrocentrism that's barfier than Eurocentrism?"
I suppose it's false claims to have invented everything and every ancient notable person was black. Africa didn't drag Europe kicking and screaming into the the modern era, it was the other way around. The modern world was built in Europe. That's just the way it is. Sorry the facts aren't multi-culti enough for you.
I haven't run across many people who argue that African colonialism was a Good Thing, on the whole. Killing or enslaving innocent people and confiscating their property through the use of overwhelming force -- as you put it, dragging them kicking and screaming for their very lives -- is nothing to be proud of.
The Republican Party may think it has an image problem, that the allegations that it's the party of upper-class white men is just bad PR -- but I see thread after thread that, were I a person of color, I would find offensive, if not repulsive.