I think this is something that needs clearing up.
The actual definition of a short story is a work that is under 10,000 words. Some would argue 8,000 is the cap. Point being, there is a limit to how long the work can be. This, in turn, creates a certain style of writing. The actual short story is one of the major forms of literary fiction.
With the rise in e-books, I think it is important to be aware of the general short story. While an author may know the differences between flash fiction, short stories, novellas and novels, the average reader does not. Many people will classify anything that is shorter than a novel as a "short story" even if it is a 30,000 word novella.
Therefore, this is something for both authors and readers to consider. Although you may have authored a wonderful novella, "short story" might be a term that more readers would understand. As for the readers, be aware that "short story" could mean a wide range of story lengths. While you may not like 500 word pieces of flash fiction, a 30,000 word novella could just be up your ally.