Some foods hate cold air. If put in the fridge, they stop being as tasty and fragrant as they usually are if kept outside.
Unripe avocados should never be kept in the fridge. This fruit needs time and average room temperature to ripen and taste the way it is supposed to. Coolers make avocados tasteless. Only if the avocado is ripe can you place it in the refrigerator. And this is all right only if you have no intention to use it right away.