Giant Food Stores complaint: Insolent, Brazen Attitude

I have been shopping at the Oxon Hill Giant since it has been opened., I shop their everyday purchasing food for the homeless and hungry. I was purchasing 5 gallon deer park waters the lines were long so I went to the self scan, the associate stated that they did not have the QR scan card at the self check so I was asked to go to the customer service desk, it was not a problem, I went to the service desk and let the gentlemen know I think his name was Alston, so I stated to him that the self check did not have a deer park qr scan. He rang me up but the comment he said was next time go to a register. I didnt appreciate that comment he made, when I spend thousands of dollars each week, as I was walking out he went up to the self check associate and was very rude. As a manager they should have checked all register to see if things are needed. I DID NOT like his attitude towards myself as a customer nor as a supervisor. It’s enough meanest in this world to have to deal with insolent employee