Why does munching sound unpleasant to most people? When someone who eats food is munching, it sounds quite unpleasant for most of the people.
What is the reason for this?
I have speculated that it arises from two cognitive biases — but pardon that I will present my conjecture without citations.  (This isn't my focal area)


our bias for music shows we dis-prefer arhythmic noises.
the arhythmic noise is unpredictable.


I think there may also be dissonance between a sympathetic response (to hunger at food odors and others' savoring of flavors), against a conscious choice not to be eating at that time. (only in the case where the person(s) experience misophonia are not also eating)