I have rediscovered (how could I have forgotten?!) just how obnoxious John Thorpe is, but how can it be wondered at? Consider his manners to his mother:

". . .they met Mrs. Thorpe, who had descried them from above, in the passage. “Ah, Mother! How do you do?” said he, giving her a hearty shake of the hand. “Where did you get that quiz of a hat? It makes you look like an old witch" . . . And this address seemed to satisfy all the fondest wishes of the mother’s heart, for she received him with the most delighted and exulting affection. On his two younger sisters he then bestowed an equal portion of his fraternal tenderness, for he asked each of them how they did, and observed that they both looked very ugly."