I go in as usual, I have my grocery bag..as I walk...

I go in as usual, I have my grocery bag..as I walk in I say hello to the young security guard..walk by then he yells at me to stop, i need to give the cashier my back pack..i tell him it's my grocery bag..and it is empty..( not a back pack, either) then to proceed to tell people I AM ONE OF THOSE PEOPLE..??? So, I left..not a good look for Ralph's..