Hard question. I hate lots of teams. Pies obviously, Richmond, Hawks, bombers, Carlton.
I have a special dislike for the West Coast Eagles. There's an arrogance and entitlement which really grates with me. Seen it up close during own ill-fated prelim in 2018 and won't forget it. I hope they languish for a long time.
Edit: forget to mention the cats. I thoroughly hate the Cats.