Because it doesn’t get the time to spoil as your body is actively removing nutrients very rapidly. Milk is a great example:
If you can digest milk sugar, lactose, then everything goes fine. Your body extracts the sugars and digests them. Any bacteria that digest the milk must survive and replicate on what’s left behind, so their growth is severely slowed and the milk dries out/gets digested by friendly bacteria and becomes poop.
If you can’t digest milk sugar, then the milk essentially is spoiling in your gut. The bacteria rapidly consume the sugar and mass replicate. Your body reacts to this and you get diarrhea.
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