why does the word ‘no’ affect people so

Why does the word ‘no’ affect people so?
     that an umbrage, however slight
     they seem to take, and opaque disappointment
     appears on the face

O poesy for this little guilt trip on this
     scarce trodden road which none else know
     beneath fair Luna’s guiding glow

So say the wolves from the darkness
of the wood:
         /Hey you, illumed, your trip
         is your own alone/
then they feast upon the echoes of my
     NO! NO! NO!