I think we've had the luxury of training ourselves to only identify the best looking produce as safe/tasty. I doubt it's ingrained in our nature, which is to say, if you're raised in a situation where you can't be as selective, I suspect you'll see a lot more produce as perfectly fine.

We definitely don't (generally) turn our noses up at various forms of rotten milk or the liquids of fruits rotten enough to be alcoholic.