I know it's long, but I'd encourage you to read through the comments to the post as this has been pretty thoroughly hashed out.
It's ostensibly an anti-KKK bill that in pre-pandemic times was used against people wearing the type of mask we're talking about here.
https://www.anapsid.org/cnd/mcs/maskcodes.html
It's in the FL state statutes here:
https://www.flsenate.gov/Laws/Statutes/2011/876.12
Thank you for still wearing a mask! In my part of FL I haven't seen one(except a cloth chin diaper this past week) in longer than I can remember.