Darcy is splitting hairs. Most definitions of vanity and pride are nearly identical to each other: Vanity:"The quality of being personally vain; high opinion of oneself; self-conceit and desire for admiration." (OED) Pride: "A high, esp. an excessively high, opinion of one's own worth or importance which gives rise to a feeling or attitude of superiority over others; inordinate self-esteem.(OED) Only one definition of pride supports Darcy's interpretation: "A consciousness of what befits, is due to, or is worthy of oneself or one's position; self-respect; self-esteem, esp. of a legitimate or healthy kind or degree."(OED)

A chicken and veal cream soup with nuts."Put a knuckle of veal into six quarts of water...send it up hot." (Farley,John. The London Art of Cookery, 1783) Full recipe here: https://www.telegraph.co.uk/foodanddrink/recipes/10323828/Jane-Austen-recipes-white-soup.html

Picture here:https://www.telegraph.co.uk/template/ver1-0/i/tmglBody.gif

Sermons to Young Women cautions women as to how to and how NOT to get a man’s attentions: “Naked in nothing should a woman be, but veil her very wit with modesty. Let a man discover, let her not display, but yield her charms of mind with sweet delay.”(Fordyce, James, Sermons p99) which elucidates this warning “Who is not shocked by the flippant impertinence of a self-conceited woman, that wants to dazzle by the supposed superiority of her powers? If you, my fair ones, have knowledge and capacity, let it be seen by your not affecting to show them, that you have something more valuable, humility and wisdom.” (Fordyce,James. Sermons p99) Miss Bingley is showing off to get Darcy’s attention. Unfortunately her behavior has the exact effect on Darcy that Fordyce warns of: “If men discover that you study to captivate them by an outside only, or by little frivolous arts….Some more sentimental spirits, who might be dazzled in the beginning, will soon be disabused.” (Fordyce, Sermons pg.10) (Title Page, 1809 edition)

.” It was customary during that time for men to take leave of women after dinner and go to a different room to smoke: "A gentlemen never smokes in the presence of ladies"(Pool, DanielWhat Jane Austen Ate and Charles Dickens Knewpp54-56 and http://chuma.cas.usf.edu/~runge/MasonJA1.html)

Vice: a. Depravity or corruption of morals; evil, immoral, or wicked habits or conduct; indulgence in degrading pleasures or practices. (OED)

Folly: The quality or state of being foolish or deficient in understanding; want of good sense, weakness or derangement of mind; also, unwise conduct. †to do folly: to act foolishly. (fond, etc.) to a folly, to an absurd degree. (OED)

Reading might convey an actual bit of knowledge to the officious man. How much easier to open a book and talk as opposed to read and actually learn something