The reason why nobody took what you said to be nothing more than satire is because satire invariably requires visual indicators to let the audience know that it is, in fact, satire. The written media, on the other hand, is not a visual media. It requires some skill for an author to effectively carry off satire. And, more often than not, the reader approaches the work knowing in advance that they're going to be reading satire.
Another reason why most took you seriously is because many writers out there have that self-deprecating attitude, and most of us are fed up with it. If you, the author, thinks your own work is garbage then why on earth would we want to read it? If the author is a new-comer to story writing, and they genuinely want to learn the skills of writing, then there are other ways to approach it than by pointing out up-front and in your face how rubbish you are. And I'm saying "you" as in these authors in general, not a particular person.
Anyway, let's not allow this topic to get hijacked by discussing the merits of satire and move quietly back to the pet peeves topic.