heckling and criticism

I think there is a monumental difference between a written piece of criticism and what I think of when I hear the word heckler. I think there is a need for criticism. When it is in the form of a piece of writing and published somewhere it means someone took the time to consider what he or she was criticizing. When I hear the word heckler, I think of harassment, impulsive and a hole. Writing about a comedian not being funny and giving reasons why is completely different from yelling, “You’re not funny” as his or her performance.