“Stupid comment, esp for a government worker... how could you not know any better than that?? posting on social media, really?”
I agree. In Florida there rules about what you must do to fire somebody. It includes counseling, an improvement plan and three warnings. Apparently that doesn’t hold if you post something that is politically incorrect.
Florida is an “at will” state. Unless such conditions are part of the employment agreement or official policy you can be shown the door for any offense. Even when such rules are in place there are exceptions for gross offenses. For example I guarantee if you threaten your boss with serious bodily harm you will not get 3 warnings.