Petty reason: They spoiled something I wanted to watch/read/play knowing full well my hatred of spoilers. Had this happen: I was actively in the process of playing through the Mass Effect series and a person gave me a massive spoiler. I've cut that person off and never wish to speak to them. They could not apologize and receive forgiveness if they tried, they might as well move on with their lives.

Non-personal reason: I would be hard if not impossible for me to forgive someone for having been an eligible voter in the US 2024 elections and having not voted for Harris.

There are many terrible things I've experienced and awful things I myself have done, but funnily enough I can forgive others and myself for them pretty easily. I think I usually can't forgive someone if they stubbornly take the stance that they know what is best for me in said actions or if they were sadistic enjoyment, petulance, or hatred. But actions taken in the moment of heightened emotion, desire, desperation, I tend to be very forgiving about if they ask for forgiveness, even if the acts themselves are often considered pretty extreme by most people.