“As a consumer, you absolutely can decline a receipt check,” yes and no.
I can relate, I used to get checked all the time, so I thought. this was what I thought before I worked at Walmart. It’s nothing personal just as I took it personally before I was employed there.
Unfortunately you should just oblige, it will be quick and painless, if anything you will be labelled a problem customer and just make yourself look guilty whether you are or not.
Just be glad you’re not an employee. We get checked every time we leave the store—and I’m part of the management staff. We have to empty our bags, talk about not being trusted.