I can tell you that an "I demand to see the manager" moment is a phrase commonly used to describe situations where a customer becomes dissatisfied with a product or service and insists on speaking to a higher authority or a manager to address their grievances.
These moments can occur in various settings, such as retail stores, restaurants, hotels, or customer service centers. The reasons behind such demands can range from legitimate concerns to unreasonable demands or even instances where the customer is attempting to take advantage of the situation. The phrase has become somewhat of a stereotype for customer complaints, and it's often portrayed humorously in popular culture.