My new Most Hated Thing are the bats in Henne Mine which are in the path to (SPOILER)Zodiark. They spam Leech, which hurts you for around 2000 and heals them for the same amount, plus they have a suicide move which hurts you for about 1500 and robs you of their EXP.

I actually just hate everything in that part of the Henne Mines.