Lol!!! ^ ^ ^ There's no racism when it comes to cichlids, just global location, and preference between which kind you like... I prefer South/Central American cichlids because they're more sociable with their owners, and recognize them as well. Their easier to teach tricks, such I had some wild caught Green Sunfish (through they're not classified as cichlids) in a native tank I had a couple of years ago, I would hold a spoon full of pellet food just above the water line, and after a couple of times of doing it they figured out that if they jump and bump the spoon it causes the pellets to pop out to eat.
As for African cichlids being more aggressive that's "true" because it's always advised to overstock an African cichlid tank to limit the aggression, but to me South American cichlids are more aggressive due to the fact that they're bigger, show more aggression when outsiders try to enter their territory, and especially because they're egg layers and defend their "nesting" site like psychopaths!!!
I've seen convict cichlids kill fully grown oscars when defending their fry... Whereas most African cichlids are mouth brooders that keep their eggs, and fry in their mouths.