We hate their aqeeda and a'maal but work to rectify them. As I understand it, we do not hate for the sake of just hating people, they are humans just like us and we hate their beliefs what they are doing - not the people per se. Otherwise, it becomes personal and that is not constructive and can drag emotions into it. This has the opposite effect and causes a barrier of emotion and hostility that keeps them at odds and away from engaging, from the opportunity to reconsider. Clearly, its difficult to detach emotions from it but, in some cases, it needs to be done (atleast prima facie - no one can see what is in your heart) for the greater good which is to bring people back to the correct Aqeeda, A'maal etc. No person is infallible and some are in darkness for years until, somehow and someway, Allah ta'ala affects them with Hidayah. Allahu A'lam