'I still got [it] for a cheaper price': Cashier refuses to honor "online only" price, dude orders it online right in front of them

Working retail is the experience of permanently being wedged between a rock and a very angry place. The rock is the obstinate management structure above you that is setting and enforcing policies that make no sense—but that they refuse to change. On the other side are the perpetually angry customers who are often upset about those exact same policies. Unfortunately, you, the lowest-level employee, take the brunt of the customer's dissatisfaction, which then becomes management dissatisfaction as they try to blame you for the customer issue, despite the fact that their own policies are what upset the customer in the first place. Eventually, you'll give up trying to argue with either side, fully hollowed out into a soulless husk with no emotion or energy left to try and work things out for the customer.

This is probably exactly who this customer was interacting with when they tried to argue prices with the cashier when the item they were purchasing rang up higher than the online price. Instead, the customer returned the microwave and went to order it online while standing right outside the store. A smooth move to get back at a ridiculous corporate policy.