why?

today i was walking happily with my mp3 the new monkey majik album playing. went into the library when this rude librarian scolded me REALLY loudly. i mean i blasted my mp3 quite loud and i could still hear it clearly -_-" it INSTANTLY killed my mood right there and then.

do you know that all of us has that "power"? to make someone's day better or in this case the other way round.

question: why do we like spoiling people's day more than making it better? a new anomaly that i realize is quite common and at the same time rather mind boggling...