A heckler interrupting from the crowd is read as criticism, inner doubt or a voice that undermines your confidence. Tradition sees it as the critic you carry inside.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.