Henry Tilney says this to Catherine Morland after she assumes he doesn't read novels because “gentlemen read better books.” He answers that anyone — man or woman — who takes no pleasure in a good novel “must be intolerably stupid,” then confesses he devoured Ann Radcliffe's The Mysteries of Udolpho in two days flat, unable to put it down.
The line sits inside Austen's broader defence of novel-reading in Northanger Abbey, a genre then widely dismissed — including by novelists themselves — as frivolous, especially for women. It is dialogue given to a witty, sympathetic character, not a narrator's aside, but it reads as Austen's own case for the novel as a serious form.
“The person, be it gentleman or lady, who has not pleasure in a good novel, must be intolerably stupid.”
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Catherine's assumption — that gentlemen don't read novels — reflects a real prejudice of the period; Austen has Henry puncture it directly, and elsewhere in the same novel steps outside the story to mount an explicit authorial defence of novels as a form (the famous “only a novel...” passage in Chapter 5).