Read the comments on this thread. First, this thread is being downgraded with negative scores. Secondly, those people saying "It's not racist, its true" are being given positive scores. Thirdly, the majority of the postings claim there is nothing wrong with that chant, and lastly the story is being used for comic content "I prefer Obama light" for example.
There have been numerous proven cases of "agent provocateur" to undermine social movements.
However, from reading the comments on this thread for support of such chants, I doubt that it was a case of provocateur. Even if it were, it seems that many here would have cheered them on.
Hopefully it was not filmed. I still hold my opinion that those chants are racist and just plain stupid.
We are like the mechanism of a watch: each part is essential.