They are doing you a massive favor. In just one word, they are telling you everything you need to know about their maturity, intellect, and personality. I love talking football with educated, polite fans. I have met BYU fans throughout my whole life where we have enjoyed some good natured debate and discussion.
But the only person I can really imagine using the word yewt is probably on par with the kids on my son’s junior high basketball team.
I doubt you would spend a lot of time debating and arguing with a 13-year-old who was name calling. Same rule should apply here. Just move on.