Should you actually hate people?

Bare with me. This sub is for these kinds of questions too.
Recently I have seen an old friend that did a very bad behavior, something like manipulating others and stuff. I do not like to type the details. Anyway I considered their acts so foul, immature and ugly. It seems like after a long time of having good people around, I just am baffled with the things some people I considered friends do. I could have confronted them but at the moment I didn’t realize what they were doing, later on someone told me.
While on my development journey, I only thought that only love is the answer, but what should I do with these objectively bad people? I cannot offer them love or even empathy. And I don’t know if hating them would do any good since most of my friends are still friends with this person.
The problem is also that most of my friends still behave normally around this person.
It seems like I’m hating on the whole group now too and am very confused.