What he said. Hearing is like learning how to talk. If you grow up in one area, in one environment, the way you speak is very different from someone from another area, whether it be language or just dialect. Auditory is the same way, people learn to listen differently. A person brought up on classical will have different auditory perception than a person brought up on rap (very extreme example, but it serves the purpose) Classical is very balanced and a person that listens to it will appreciate instrument separation and resolution as well as sound stage far differently as the person brought up on rap. Likely the person brought up on rap will find lack of resolution not as bad as someone who was brought up on classical.
As uncle erik also stated, musical training has a lot to do with it as well. People who take music theory or were part of a band learn to listen for musical cues, and thus tend to scan the music mentally.
Quote:
Originally Posted by
Uncle Erik 
Life experiences also change how you interpret music. I spent years playing in bands and orchestras. My brain starts scanning the orchestra for proper pitch, intonation and the same cues I listened for while trying to blend with the group while playing.
Likely why certain "plasticky" sounding headphones drove me crazy.
