[Quick1]

If you refuse to show a receipt for your "purchase" upon leaving the store, that is going to raise an inference of shoplifting.

Sorry, refusal to show a receipt does not constitute reasonable grounds for detainment, especially when you ask everyone for the receipt, otherwise you are saying you suspect EVERYONE of shoplifting. Those laws that allow detainment all pretty much require someone to have witnessed the person putting it in their pocket, and then continual monitoring as the person skipped the checkout counter and out the door. Asking someone if they stole something, and then detaining them when they say "no", also does not constitute grounds for detainment.

[AppyPappy]

refusal to show a receipt does not constitute reasonable grounds for detainment

That depends on whether or not you are on private propery. They have a lot of latitude when you are on their property. The best idea is to stay off their property if they engage in this behavior. But I suspect most offended people are powerless to do that because they are sheeple.

[Publius Valerius]

Sorry, refusal to show a receipt does not constitute reasonable grounds for detainment, especially when you ask everyone for the receipt, otherwise you are saying you suspect EVERYONE of shoplifting.

No, you're not suspecting everyone of shoplifting. You are suspecting the people who don't show their receipt of shoplifting, which is a reasonable inference. There is simply no reason for a non-shoplifter not to show a receipt. It benefits everyone. It helps the store control shrinkage and helps keep prices down, which benefits consumers.

This guy refused to show is receipt; he was detained. He tried to leave--which is attempted escape (a crime with which he ought be charged)--and he paid a little bit of a price for it. If you want to be a jerk, be prepared for the consequences.