They asked about the Intl API in JavaScript, specifically how it handles localization. I honestly answered that I hadn’t used it before and suggested that in a real-world scenario, I would likely rely on a library or make an API call to handle such functionality. I also added that JavaScript probably has some internal object or mapping for these things. The interviewer dismissed my response abruptly and responded in a condescending tone, rather than encouraging a constructive or open conversation.