Really depends on the person. Get a crotchety old guy and you may notice only certain people getting stopped. Or sometimes their tone obviously suggests you stole the groceries you just purchased, even though they have literally no authority or right to suggest such a thing. Or consider when I was ~12, a pedophile old man Walmart greeter tried to make moves on me. But that one might just be me.

The practice feels like/arguably is an accusation. From a multi-billion dollar corporation. When I legitimately bought this shit. Get out of my way.