Final answer:
The store associate should apologize and offer assistance to the annoyed customer, demonstrating empathy and a willingness to resolve the issue.
Step-by-step explanation:
The most appropriate initial response from the store associate when faced with an annoyed customer is to apologize and ask how to help. This approach demonstrates empathy, acknowledges the customer's feelings, and shows a willingness to resolve the issue. It is important for the associate to remain calm and professional, regardless of the customer's demeanor. In business, especially in customer service, the goal is to ensure that the customer feels heard and that their concerns are addressed in a satisfactory manner. Ignoring the customer, explaining why they are wrong, or expressing annoyance in return would likely escalate the situation and damage the business's reputation.