Is It OK to Talk on Your Phone When You're at the Checkout?

The UK media is weirdly ablaze this morning over a story about a store attendant who flipped out when a customer refused to stop talking on her phone while at the checkout. But is that rude, or is it now socially acceptable?

According to the customer, a 26-year-old Jo Clarke, the store assistant barked “I will not check your shopping out until you get off your mobile phone." It could be argued that both of them were being a little rude, but whose side are you on? [Gizmodo UK]