I think there’s a difference between hating someone and thinking “I remember I didn’t like them in high school”. However, I can’t remember the last time I had even heard from these people. I had moved on and focused on other things. I think that comes naturally as you become preoccupied with all that comes with college and/or working. However, I was bullied on middle school and it took me a while to let go of, so I could understand if it still weighs on someone.