system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why does the sound of a knife/fork screeching on a dinner plate sound so terrible to us humans?

I almost want to cry after having heard it - but why?
gpt
The two main theories are:
1) The sound reminds us of the sounds/calls a lot of primates and apes make when they are scared, in stress or alarmed. It could be hardcoded in our DNA to react to this sound with negative emotion, stress and fear
2) The typical frequencies produced are the same that can give rise to resonance in the ear canal, thereby amplifying the sound to unpleasant or even painful levels.