It's the same reason why people refuse to drink "recycled" water (processed pee/poop water).
Chemically-speaking, the recycled water actually comes out cleaner than your "real" tap water, but that doesn't matter. Most people have an irrational (not based in science) aversion to drinking water that used-to-be pee/poop.
It tastes like nothing, because it is literally all pure H2O (which has no taste). Yes... I have 1st-hand experience with recycled water.
In reality, all water on the planet has a good chance that it was poop/pee at one time or another.
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