a bit of a "dig" at Lizzy, who had earlier said to CB "I am not a great reader". Despite Lizzy claiming such, I personally have already formed the impression that she is quite literate and that perhaps Darcy suspects this as well.

Earlier, when Lizzy entered the room, she was invited to play cards. She declined due to the high stakes involved but couldn't admit to such, of course. CB took her refusal as a snub of the card-playing group and stated, sarcastically I believe, that Lizzy hates cards, and is such a great reader that she likes nothing else. Lizzy, realizing CB means no compliment, denies this.