Ongoing hatred, as much as it is human, eats at the spirit, does it not? I have found as I age that it is easier to analyze the hatred, find its roots, and try to laugh at the people that cause it. Laugh at them for their ineptness in life, their walled-in narcissism as they crash through the world, flailing about in helpless attempts at relevance. And laugh at them knowing that, if they even make it that far, they will sit old and decrepit, eaten away by the bile of their selfishness and mania, and stew in a pool of dementia and insignificance.
All that said, a good bout of angst and animus is also healthy. We are not Vulcans.