Two statements about characters can and should co-exist: Pride and Prejudice edition
Mr Bennet has a close relationship with Elizabeth and provides amusing observations on the folly of human nature BUT he is a terrible husband and father who consistently neglects the women who rely on him for absolutely everything; Elizabeth and Jane turned out so well in spite of him, not because of him.
Mrs Bennet's behaviour is understandable given the era in which she lived and the subsequent pressure she was under to get her daughters married well, which wasn't entirely for vanity reasons given that Longbourn was entailed BUT she was still fundamentally vain, ridiculous and rude; such pressure, even combined with an absent husband, still does not make her behaviour justifiable, nor her a sympathetic character, as she enabled Lydia (whose subsequent elopement with Wickham almost ruined the family) for far too long.
Mr Collins is unfairly portrayed as a middle-aged sycophant in most adaptations, rather than the young clergyman who sucks up to his patroness in pursuit of a more lucrative living that he was BUT he is still a ridiculous character who you are not meant to feel sympathy for when Elizabeth rejects him; he is rude, hypocritical and thinks of himself far too highly considering how vapid he actually is.
Caroline Bingley is often too harshly judged as a 'pick-me,' even though her relentless pursuit of Darcy is understandable given his wealth & status and how important it was for women to make a good marriage BUT she was still rude, vain and treated Jane terribly; plus she was a hypocritical snob, given the manner in which she looked down upon the Bennet family's relations despite the Bingleys' own background in trade.
Elizabeth is incredibly witty, courageous and endearing and instantly likeable which makes Darcy's slight of her at the Meryton assembly all the more of an affront to us as readers BUT, while it explains her dislike of him, she is no means perfect herself; she had far too much misplaced pride in her ability to successfully read others' characters and consequently ignored positive accounts of Darcy in favour of believing the deceitful Wickham, given her prejudice against the former.
Mr Darcy was harshly judged by Elizabeth, even though there are many more sympathetic elements to his character than immediately meet the eye BUT he was not shy or innocent; he was always a haughty rich man who had never been told no, thought far too highly of himself and, ultimately, thoroughly deserved to be rebuked and subsequently made to reform his character.