Lord Orville is part of the nobility, a privileged class and revered class in 18th-century British society. Because of this admiration, many lower-class people aspired to join the nobility—or at least to make it
look like they had, by name-dropping or spending time with nobles. However, social mobility was almost impossible in this period, and those who tried to transcend their class were looked down upon by the nobility as deluded social climbers. Evelina does not want Lord Orville to think of her like this, because she does not aspire to join the nobility and is happy with her middle-class status.