Does this sound natural? I want to use the phrase 'tempest in a teapot' I don't understand why people are arguing about such a trivial matter as if it's a big issue. It's so-called 'a tempest in a teapot', isn't it?
@fukutaka That is an extremely old and rarely used phrase. People are more likely to understand if you say they're (or someone is) "making a mountain out of a molehill". If you are doing a formal writing then the teapot phrase may be okay. In conversation, the molehill phrase is more common, and extremely informally: "they're making something out of nothing," is fairly common as well.
@fukutaka After re-reading my reply, I wasn't sure I was clear that the LAST one is the informal one. And depending on your level, you probably already know this, but among friends, I think you're most likely to hear "I don't know why they're making such a big deal out of it," and it will be understood that it's because it's something that seems trivial.