Given the amount of perpetual torture these very-likely-to-be-sentient creatures go through, it’s certainly worse than any genocide in history has ever been. Even if you only think that animals are capable of 5% of the suffering of humans.

Ontop of that, factory farming is a lovecraftian horror that floods the universe with terrible agony. And there’s very good reason to believe that the suffering of animals is as real and awful as yours or mine.