[foal]

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My point in OP was that if one thought humans have objective huge value, then there would be no rational argument to think animals don't have similar value as well.

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Value is inherently subjective by pretty much any way we can describe it, so there just isn't much room for rational arguments there. If you're going to say "if humans have value then animals have value too", you are essentially saying "the same reasons that humans have value also apply to other animals". Since we don't know the reasons humans have value, this argument can't be evaluated.

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If they said morality is always subjective, and they (irrationally) believe in humans as a higher species, my thought would be pretty much the same as SNOWBALL138's thought regarding Hitler's thinking of Aryan race as a higher race.

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I don't know why you're combining subjective morality with believing in humans as a higher species. I think most moral relativists would consider "higher" a completely subjective term.