Setting aside the silliness of the agenda and the absurd rhetoric that comes out of Tallahassee (and one particular idiot specifically), I find this a little amusing.
Recall that during antebellum period, there were "slave states" and "free states." Florida was squarely in the "slave state" category (and proud of it!).
And keep in mind that while the Florida state flag purports to evoke the Spanish imperial flag with the red lines crossing on a white background, the fact that the jagged parts are missing suggests that Florida also wanted to (however subtly) recall its own past as a "slave state" and being part of the south.
So to put up signs that refer to Florida as a "free state" is, in fact, quite funny.