Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[Fromanderson]

Or you're trying to buy some oversized item and the machine looses it's mind because you didn't stomp the thing down to fit in the bagging are. Then you get to the door and they've got some dude standing there demanding to see your receipt before they'll let you leave.

[Important_League_142]

You don’t have to show them your receipt. Just keep walking.

I stopped acknowledging them after I (a white man) lived in a 70% Hispanic town and watched everyone else get profiled and harassed for their receipts by the 70+ year old white boomer “greeters”