I'll raise you this:

Customer: "Well aren't you going to bag that for me?"

Me: "No ma'am I only have Starbucks bags here which I can only give you if you buy Starbucks merchandise"

Customer: "Okay well you're gonna get me a grocery bag then right?"

Me: "I don't have grocery bags over here."

Customer: "So go get one"

*My coworker comes over* Her: "Ma'am this is a Starbucks kiosk, we are baristas, not grocery clerks so we will not be leaving this kiosk. If you'd like a bag you can take your receipt over to the grocery section and pay 50¢ for a bag like everyone else."

Customer: "Well don't you have an attitude!"

Coworker: "You had one first."

But they can check you out at tarbucks….

Ooooh this pissed me off when I used to work for a grocery store location. Following charging 50 cents for water and getting yelled at for even changing it but I remained calm and tell them if they have a problem, they can direct their anger at the help desk.

My grocery kiosk can and we do all the time. Though TBF is usually just a couple things while someone gets drinks as well; if someone came up with a full cart I would turn them away.

This isn't a wild assumption tbh. My Safeway and Martin's Starbucks kiosks can both ring you out for grocery items due to sharing a POS system. Just one of those questions where you've gotta be glad people ask instead of presume.

That said people coming up with like a full loaded small cart asking for three drinks and for me to ring their items out can buzz off.