I visit Walmart infrequently as this happens all the time. I will be checking out and two clerks will be chatting with each other.
Each time, they have continued to yak while the one at the register goes through the motions of my transaction -- totally ignoring me -- the customer! WE pay their salaries and a "thank you" at the end of a transaction would be nice -- as would an acknowledgement that I'm even there.
I even said, "Hello", as I came to the register to have neither of them even look at me. Customer service is dead at Walmart!