The discussion centers around the perceived rudeness of responding with "What?" when someone calls another person's name, contrasting it with more polite alternatives like "Yes?" or "How may I help you?" Participants express differing views on whether "What?" is inherently rude, with some arguing that it can be a thoughtless response that conveys annoyance, while others believe it is a straightforward acknowledgment that saves time. The conversation touches on the evolution of language and etiquette, suggesting that societal norms around communication are changing. Tone of voice and context are highlighted as critical factors in determining the rudeness of a response. Ultimately, the thread reveals a divide between traditional expectations of politeness and more modern, casual interactions, with some participants advocating for a broader perspective on what constitutes rudeness in communication.