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"There certainly was some great mismanagement in the education of those two young men. One has got all the goodness, and the other all the appearance of it." (40.14-15)
This is Darcy and Wickham that she's talking about. Wickham is basically evil, and Darcy is, well, all you have to do is google "Darcy perfect man" to see what people think about him. But when we first meet them, we're just as taken in as Lizzy.