There are two people I hate. This really takes no energy, and it doesn't harm me to hate them. It's more like inertia, and would probably take energy for me to stop. Both are, indeed, banned from my life - although in one case this impacts my ability to do things than it does his, but whatever.
I can't forgive my abusers. Forgiveness was part of the cycle of abuse. Even though they are not in my life, I won't participate in that cycle any longer, so no forgiveness, and continuing hatred.
I have seen someone act on hatred on a daily basis, and he did spend so much energy on hatred that it was just exhausting to see him at work. He'd be so much happier if he didn't spend that energy on expressing his hatred for people who didn't care whether he lived or died (but I was one of those people, so I may be biased. I don't hate him, but I did ban him from my life as well, and I wish he'd resolve the pain in his own life instead of lashing out at anyone who does not comply with his expectations).