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Folks, this is not worth arguing about. If you do not want to cooperate with the procedure, then don't. I would doubt that it will have any repercussions one way or the other. But, I don't see why anyone would think it incumbent to protest the "invasion" by taking it out on the poor schmuck stuck on door duty with tricks. Comply, or don't comply, I really do not care. If the store management thinks you are stealing I would think that a check of the receipt would be the least invasive contact you will experience. If you think the employee would be more productive elsewhere in the store, let the management know. I doubt seriously that the person volunteered for that position.
I carry, I show the receipt. I take the receipt with me since if I have to return the stuff for some reason, they will ask for it, and it might have personal information that I would prefer not to have in a stranger's hands.

We have been over this ground to some extent before. I do not see an accusation of anything in these folks asking to see the receipt or even to look in your bag. At that point (inside the door) you are still on their property and still subject to some inspection by the business.
What I see is a person who is likely minimally employed, trying to do what they have been told to do, and keep the job.
I see no reason to mess with them, harass them, confuse them or otherwise make a miserable job any worse, simply because they ask to see the receipt. I certainly would not see a reason to actually enjoy doing so.