I don’t know why people have a problem with it.
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Because some people need something to be annoyed about. That person at the door has to eke out a living too and I’m not going to make their life miserable over a door check. I offer to show my receipt everytime I pass the person monitoring the Walmart exit and I get flagged through 99% of the time. If they want to check the receipt it will add 15 seconds max to my trip. I’m not harmed and I can feel better that I have made their life less stressful.
You’re a sensible person.
(Yes, some seem to thrive on being perpetually aggrieved about something or other.)