 Though Raymond and Martian live in something comparable to a castle, Raymond "turns his nose up to it."  This shows that
Besides, if she really was his great-great-grand-daughter, as she said, why would she tell him to call her " Aunt Ninian "? "He's dissatisfied with the current social order and killing you is part of an elaborate plan he's formulated to change it. Martin was told to call him Uncle Raymond. From time to time, there were other visitors—Uncles Ives and Bartholomew and Olaf, Aunts Ottillie and Grania and Lalage, and many more—all cousins to one another, he was told, all descendants of his. The non-glass part of the house was of neat, natural-toned wood, with a neat green lawn in front and a neat parti-colored garden in back. Though they were in the house with him, in their minds and in their talk they were living in another world—a world of warmth and peace and plenty where nobody worked, except in the government service or the essential professions. There was no devastation, no war, no unhappiness, none of the concomitants of normal living. It was then that Martin began to realize that either the whole lot of them were insane, or what Ninian had told him at first was the truth. When Martin was sixteen, Raymond took him aside for the talk Ninian had promised five years before. You see, he's an idealist," Raymond explained, pronouncing the last word with distaste.
 for the people from the future, regardless of its grandeur, nothing in the past is good enough for them.
 for the people from the future, regardless of its grandeur, nothing in the past is good enough for them.  in the past, class was determined by what you had to show, and in the future, it is based upon who you are as a person.  Materialism doesn't exist in the future.  Raymond's purpose there is to show Martin the finer things life has to offer above any other purpose.  in the future, people have taste, whereas people in Martin's time do not.