For me, the most hated villains the the ones who are not labeled as villains. If the villains are known, then you can put up your defenses whenever they get near, but those who are supposed to be friends or righteous who keeps making life hell for you, or to cause harms to you by either their ignorant, stupidity, or pride should be called out as such and pay for their crimes. I'm talking about like Ke Zhen E, the Quan Zhen sect in LOCH, the Quan Zhen sect, Guo Fu, Huang Rong in ROCH.
OK. Ke Zhen E did realized his big mistake, and told Guo Jing to go find Huang Rong, but did the Quan Zhen sect ever aplogized and take their responsibility for wanting to kill Huang Yaoshi ? And in ROCH, the Quan Zhen sect, Guo Fu, and Huang Rong never really apolgized and take responsibility for their mistakes with Yang Guo and XLN. After mistreating Yang Guo and kill Grandny Sun, the next time they met, except for Hao Datong which was directly responsible for killing Grandny Sun, all Sun Bu'er did was about how Yang Guo not respecting her sect and XLN striked Zhao Zhijing. And after realized Yin Zhiping raped XLN, all they did was basically chase Yang Guo and XLN out of Chongyang palace as quickly as possible. And did Huang Rong ever realized that by trying to split Yang Guo and Xiao Longnu, she almost caused the deaths of Yang Guo and XLN in the Passionless valley, or caused their lifetime regret if XLN married Gongsun Zhi, and the main reason why Yang Guo went back to Xiang Jang to kill Guo Jing? But even knowing how much her daughter and her family caused griefs to Yang Guo and XLN, suspecting Guo Xiang having a date whe Yang Guo, what did she do? She armed herself with hidden weapons, blades and her short stick to go check if Guo Xiang was meeting with Yang Guo. Was she going to kill Yang Guo? Having friends like this, it was good that Yang Guo just went away for the 16 years waiting for his wife.