Lot is on the top of my list as someone who has total disregard for his family. I am disgusted by his actions towards his daughters. I never understood how people could be on a KH platform providing a justification for his action. Those people disgust me as much as Lot.
A close second is Solomon. I think he was an idiot with regards to not understanding how his personal excesses destroyed a nation. He has no concept of economic development and squandered an opportunity to build a strong economic kingdom.