We don't have those kinds of signs around here, at least not that I've seen. Why even have them? It's not like the signs for pregnant women, who may have a legitimate need for a space close to the doors. And none of these special parking spaces are remotely like the handicapped parking spaces, where it is against the law to park in them if you don't have the appropriate placard/sticker.
I highly doubt a store will ban you if you park in one of those spaces with the "wrong" kind of car. So I don't understand why someone would get so upset to the point of screaming at another person for parking there.
I have to admit I see those signs as suggestions, not orders. If it's pouring rain and there's an empty spot close to the door that isn't a handicapped spot, I'm taking it. No matter what sign the store management may have seen fit to put there.