Rosa Parks disobeyed a law that was patently unjust, and she did so without an eye to her own interests. Nobody involved in the Florida/Michigan debacle can make such a claim.

Should the DNC just roll over if any state unilaterally decides that it wants to go first? How is that fair to other states?

If the analogy applies at all, Florida and Michigan told the rest of the states to go sit down at the back of the bus.