I'm afraid I don't buy this argument about being uncomfortable.  I know
of no person who is afraid to look at one's neighbor at a concert, or who
feels there is a particular mystery attached to the event.  As for the
applause, all a newcomer needs to do - if s/he is unsure what to do - is
to wait until most people applaud.  Is that so difficult?

As for disturbing the audience with your booing, that's another example
of utmost lack of consideration, or even of extreme rudeness.  *You* may
be bored - so leave the concert hall quietly - but other people may enjoy
the music.  Thanks goodness most people are more polite than you.

-Margaret Mikulska