Floyd Mayweather responds to Tip’s “Fu*k N***a” and 50 Cent’s incessant ball-busting. It’s safe to say that Floyd Mayweather has had a contentious rapport with several prominent rappers. The undefeated champion has long flaunted his obscene, though admittedly hard-earned wealth, spending it as he sees fit. A few days back, Floyd took to the Gucci store in the wake of …