What's being described here sounds a lot like misophonia <link>; intense negative emotion due to often very specific sounds. The Wikipedia page I linked to there, has this to say...
Quote:
One study found that around 80% of the sounds were related to the mouth (eating, slurping, chewing or popping gum, whispering, etc.)
I certainly find these kind of sounds very distracting and impossible to ignore, though for me, the sound of lots of people all talking at the same time is much, much worse, and will make me have a melt-down/shut-down quite quickly if I don't get away from it.
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