I thought BOR and Sharpton were somewhat friendly with each other.
They used to be seen dining together, in NYC. My theory is that, especially Since Al Charlatan got his show on MSNBC, they figured it would be better for both of their public images, if they were seen as antagonists. It would not surprise me in the least, if they still dine together, but in private rooms. In my opinion, they are both phonies, of the highest order.