Which is less likely with fluorine because what fluorine reacts with to form the salt, say Na as in NaF, wants to give up an electron, not receive one. And with fluorine as a partner, Na will have the hardest* time retrieving that electron to give to something else. This can be easily validated by comparing enthalpy of reaction and formation for the various halide salts.
The properties of broad chemical stability are not limited to ionically bonded fluorine either, see PTFE, which also derives its stability from the extreme reactivity of fluorine. Compared to say PTIE (polytetraiodoethylene), which if you could even make would rapidly yellow and degrade in open air/mild sunlight, as iodine compounds are wont to do.
The properties of broad chemical stability are not limited to ionically bonded fluorine either, see PTFE, which also derives its stability from the extreme reactivity of fluorine. Compared to say PTIE (polytetraiodoethylene), which if you could even make would rapidly yellow and degrade in open air/mild sunlight, as iodine compounds are wont to do.
*for a loose definition of hardest.