1) New one. Not all men are created equal, but they deserve equal treatment before the law.
Similarly, only those who contribute to the economy (or nation in the case of military) should be able to vote. Just because you were born doesn't mean you have the natural right to vote. Black skin or a vagina doesn't put you above these requirements (if anything, it makes them more stringent).
2) Racism is a Marxist term. Are we racist? Yes. Fuck off. Are we "mean" or "bad" to those of other races? Of course not. If equality is so great, it doesn't need laws to force it. If people want to segregate and are happier for it, let them. We want a wholesome nation where people are judged on the content of their character, not on identity politics and affirmative action.
3) Florida has always been a retirement state and has never been really part of the south.
I'd say follow in Greenland's footsteps. If you are an American, then you can stay in the South indefinitely just as a Scandinavian can do in Greenland. If you want to vote, have access to public benefits, etc. You must renounce your Northern citizenship and pass a citizenship test.
Alternatively, give a five year grace period for Northerners to cross the border in/out of the south, and then enforce an immigration policy similar to that between the US and Canada.