Evolution. Taste and flavor are subjective experiences created by the brain, not necessarily physical properties of the thing you’re eating (it doesn’t taste like anything to a tree).
We evolved to be disgusted and have gag reflexes to toxic things. Too much salt is bad for you. It tasting awful is just the cue your body sends you to tell you to stop. It also is useful that we feel that way because we need water, but you definitely shouldn’t drink sea water. You’ll die.
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