Dear Dan: A good friend hosted me for a birthday dinner, and the elegant table was set with crystal stemware—but the wine he served was sealed with a screw cap. Should I be offended?—Wine Novice Dear Wine Novice: Have you been living in Siberia for the last 50 years? Around 1970, screw caps were associated with cheap wines, derelicts, brown bags, and gutters. But soon, wineries around the world began hearing about the real reason screw caps made a lot of sense. In fact, if the wine your friend served was a 2018 PlumpJack cabernet sauvignon, you should be impressed. It’s a prestigious offering from the Napa Valley winery, one of whose partners is California Gov. Gavin Newsom, and it sells for $160 a bottle. It has a cap. I’d advise you to start reading newspaper wine columns and get up to speed. It’s easy to understand Wine Novice’s confusion. …