I think Mr. Darcy was unfairly critical of Mr. Bennet in his letter to Lizzy. (Ch. 34) - "The situation of your mother's family… so uniformly betrayed by herself, by your three younger sisters and occasionally even by your father."
What situation is he referring to here? I haven't seen any evidence of Mr. B 'misbehaving' so far. Did I miss something? In P&P2, Mr. B. does step in when Mary kept going on and on. In Ch. 6, he doesn't interfere at all. Just think Darcy was too harsh here. Must have caused Lizzy particular pain since she loved her father so much.