Echoing what a couple others here have said: Jane Austen was a keen observer of human interaction, and likely took pleasure in doing so and then taking the best (worst?) of what she saw to reflect it back at the society of her day in her books. And she didn’t shy away from some characterizations that might have been mean (if not at least impertinent) that may not have been done by other contemporaries.
And please read Persuasion, that one is my favorite!