Sure, I've felt anger recently.
As far as hatred, it takes a lot for me to hate someone but when I do, it doesn't get forgotten. Around four years ago, someone did me some serious dirt. I ended up putting away the hatred for years, forgetting about it most of the time. Recently an opportunity to stick a knife into him (not from behind but face to face, including his superior) came available. I took it and he was fired. I don't seek opportunity to do dirt but know that sooner or later, an opportunity will present itself if I'm patient.