I did mention some negatives: his criticism of Bingley's false humility and his agreement with criticisms of the Bennet family. I have mentioned in another post how he appears to slam the Bingleys' background in comparison with his own. Yes, he can be brutally honest, and that's not always a good thing.

Darcy does not pretend to himself that the Bennets' behavior has no influence on his actions. But this is different than their influencing, as you said, "Darcy's opinion of her." He will not listen to Caroline's criticisms of Elizabeth's attractiveness. His opinion of her person and character is high. He just doesn't want to get involved with her because of her status and connections.

I disagree that he takes pride in the resentfulness of his temper. He did not volunteer this information. He was not parading it. He was replying to Lizzy's persistent skepticism about his glorious character. He admits, "I have faults enough..."