Well on the one hand, I see the connection Africa > Banana > Roberto Carlos > mixed race guy..
(but it is actually quite far fetched, and bananas are just..... silly! ) And Roberto Carlos is not even particularly black, is he? He looks a bit like a Southern European person to me. Greek maybe.
Then I don't get the point at all.
Of course people who throw fruits to the football players should be penaltied if caught. That's all. No connection to the topic.