I don’t really know…
Having to be 21 to buy a beer, and nobody being allowed to drink in public, does kind of sound very extreme limitations to somebody living in Europe.
What they mean is that the people in Florida have a different understanding of the word “legal”.
When most people hear the word “illegal” they think “there will be consequences if I do that”. When Floridians hear the word “illegal” it translates to something between “rude” and “fun”.