Only three things I really despise:
1 - Tomatoes from the store. God never intended tomatoes to be chewy.
2 - Boiled okra. Pickled okra is good and fried okra is a wonderful thing. Boiled okra is a mucilaginous mess.
3 - Anything imitation. Veggie burgers, fast "food," stuff that is processed and loaded down with chemicals to make it seem like something else... Real, honest food is great. Imitation "food" is an abomination.