Of course, everyone has a right to sue. But is her lawsuit worthy? If the song has no artistic reason to be called Rosa Parks then its legit, but you cant sue someone for calling women "ho's" and black people "niggas". Thats just 1st ammendment stuff.
And Rosa cant sue for being offended. There is no right NOT to be offended. I hate rap but ill defend their right to be complete idiots just like Ill defend Barbra, Rob Reiner and Alec Baldwin to be complete moronic idiots. The moment they try to get legislation to silence me is when ill arm up against them.