Produce injustice

Grocery store. Produce section. Someone once told me that you only have to refrigerate the things that are refrigerated at the grocery store. Tomatoes for example are traditionally not refrigerated at the store, so technically, does this mean you're not supposed to refrigerate them when you get home? I picked up a bag of tasty, sweet, purple grapes on Monday and noticed that it was on a display that was not refrigerated. So I put them in my fruit bowl on the counter and forgot about them. Today I helped myself to some grapes and they're furry! Ewww! I guess I should have refrigerated them after all! How are you supposed to know? This is an outrage!