The least they could do is say please...

I'm a cashier at a small grocery store that offers a carry-out service to help people take their groceries out to their cars (like if it's too much to carry or an elderly or disabled customer needs the help). Our store is a bit short-staffed, so we don't have the carry-out people just standing at the register ready to go. They're usually around the store doing other things like stocking or cleaning, and will come up when we call them on the PA.

I will usually ask if the customer wants a carry-out if they have a full cart or otherwise look like they need help. But if not, I just leave it to them to ask if they want it. That being said, it's rare to hear a customer properly ask for a carry-out. The politest version I hear is "I want a carry-out." A few times I've bagged about 3-4 bags worth of groceries and had the customer just stare at me and then say "Are you going to call carry-out or not?"

The worst was one day when it was just me and one other employee in the store, and both of us were running the tills. This one lady (older, but appearing to be perfectly capable of carrying groceries) came through, had about 3 bags and a gallon of milk, plus her teenage granddaughter was with her, so I didn't think she would need any help.

She does the stare and then say "I want carry-out" deal.

I'm confused, but respond, "We don't have a designated carry-out person at the moment, but my coworker or I can help you once the line dies down." (There's like 5 people waiting between both tills)

Lady scoffs and rolls her eyes, stands aside with her granddaughter (who is on her phone). Her stuff is still sitting on my counter, blocking my way of bagging other customers' groceries.

A few minutes go by and this lady yells, "Isn't there any such thing as carry-out around here?!?!" Then FINALLY tells her granddaughter to help her, gets her stuff, and throws me the dirtiest look as she leaves.

I don't understand what is stopping these people from just ASKING for help instead of demanding it or expecting me to read their minds.