There is nothing worse in an audience than one who sits through a mediocre production, knows it's bad, and accepts it without question. If you are unsatisfied with a performance- you should speak up.
We celebrate an open dialogue between the performer and the audience. If you hate something, you have to give me a good reason why.
But this is not what this site celebrates. Of course, there are nasty hecklers who are mean for no reason at all.