The same reasons why a human detests another human.
Some might have had bad experiences with animals in the past but then some hate them for the sake of hating. There are people who don't hate exactly but they don't care either if anything happens. It's a choice. Some people enjoy hurting because animals are helpless and can't do anything about it.
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Answer:
The same reasons why a human detests another human.
Some might have had bad experiences with animals in the past but then some hate them for the sake of hating. There are people who don't hate exactly but they don't care either if anything happens. It's a choice. Some people enjoy hurting because animals are helpless and can't do anything about it.