To counter your reductio ad absurdum: Because you choose to live in Jacksonville. You don't choose to be black.
But otherwise you have a point. Judging individuals based solely on stereotypes is wrong. But in this case, this band ALSO says "I'm not political" and ALSO had signed up to play with Kid Rock. So...
I know some really wonderful people who are stuck in Jacksonville but don't fit the stereotype. But they also recognize that it's generally a racist shithole. So if anyone is from there, I'd say it's fair that they lose the benefit of the doubt.