What does Mark Twain satirize in this excerpt from "The £1,000,000 Bank-Note"?

It was a lovely dinner-party of fourteen. The Duke and Duchess of Shoreditch, and their daughter the Lady Anne-Grace-Eleanor-Celeste-and-so-f orth-and-so-forth-de-Bohun, the Earl and Countess of Newgate, Viscount Cheapside, Lord and Lady Blatherskite, some untitled people of both sexes, the minister and his wife and daughter, and his daughter's visiting friend, an English girl of twenty-two, named Portia Langham, whom I fell in love with in two minutes, and she with me—I could see it without glasses. There was still another guest, an American—but I am a little ahead of my story.
Which types of themes distinguish literature written in the realist era from earlier literature?