Air conditioning

Florida is the warm state.. there's no discussion about that. And that's why I love Florida but what I don't understand is that when you go into shops, the cinema or whatever the air conditioning is on something like 60 degrees so its freezing. You wear clothes based on the weather outside, so when its 90 degrees outside, you're wearing shorts and t shirts etc but then you go into a store and the AC is on 60 degrees and you're freezing. Doesn't anyone realize that this fluctuation between 90 and 60 degrees is enough to get anyone sick.