Was staying with my (very lovely) MIL last week
She is great but doesn't refrigerate cooked food! She will cook a Sunday roast, make a couple of extra dinners for the next day, and leave the whole lot (beef, potatoes, gravy, veg) with a bit of foil loosely over the top, just sitting on the side, to have the next day.
Or she will do a food shop at lunchtime for dinner that evening, say a pizza, and not put it in the fridge, as she's just going to heat it up later!
Is it a generational thing. DP says she's always done it and none of them ever got sick!