RA's blog post explaining what happened: http://www.xxlmag.com/online/?p=61084
Basically RA who's a huge boxing fan was on Shade 45 and the interview turned to boxing. He expressed his disappointment in the direction of Floyd's career since the Corrales fight. Floyd heard the interview and called in. The audio is about 21 minutes but it's well worth listening to the whole conversation. Every excuse that Floyd throws out there R.A. shuts down. He might be an ok rapper but his combination of boxing knowledge and quick wit make this a classic! Especially when they start talking about what will happen to Floyd's legacy if he doesn't start fighting the best.