Racism exists in all leagues.
Not much can be done.
I'm in no way condoning it. It's just a very difficult issue to deal with.
Also, I believe the targets of racist chants are, for a lack of a better word, strategic as well. Balotelli is a loose cannon, that's why they attack him. And Boateng is an egotistical moron, that's why they attack him. The chants are directed to distinct personalities.
You don't hear much racist chants, if any, on Obiang and Niang for example.