A lot of rap music is very degrading to women, and I totally agree that men should not degrade women, in music or in their public / private lives.
But did women really fight for men not to degrade them only so they could degrade themselves? It feels like the end result is exactly the same; either a man calls a woman a sexual object, or a woman calls herself a sexual object, to which a man will likely agree. It's a bit like someone pointing a gun at you, and you taking their gun and shooting yourself in the head.
People are allowed to write and perform the lyrics they want, but don't give me the "this is so empowering" crap. Being empowered should be a positive thing; this is not.