Harassed by Walmart

Maybe it's just the city I live in where this happens but I just wanna rant quickly. I'm actually getting really tired of being harassed by the Walmart door greeter every time we leave the store and am tired of seeing them harass others as well. This has nothing to do with race, gender or anything of the sort. But it's actually pretty offensive that they stop and ask everyone to see their receipts as most of us (myself at least) are paying customers and it's almost like a slap in the face that they just assume EVERYONE is stealing. I would actually love to see some store policy that says they're allowed to do this.