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"His pride," said Miss Lucas, "does not offend me so much as pride often does, because there is an excuse for it. One cannot wonder that so very fine a young man, with family, fortune, everything in his favour, should think highly of himself. If I may so express it, he has a right to be proud." (5.18)
It looks like Charlotte agrees with Mr. Darcy: some people really do deserve to be proud. Of course, notice that she doesn't say anything about his character. She thinks he has a right to be proud because he's good looking and comes from a rich family.