I think part of the old-person anxiety about leaving the fridge open is that they would have had an icebox growing up, which is basically a big poorly-insulated cooler. Closing the icebox or cooler is vital. Leave the fridge open for a minute - oh no, an extra 5 cents of electricity.
Speaking as a non-old person (I'm under 40) who has also "yelled at" kids for leaving the fridge door open: A minute? No. More like "please be sure you didn't close the door on a towel or something, meaning it stays open all night and we lose a freezer full of meat".
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