If you write fanfics (especially if you post on ff.net) you most likely have been either flamed or flamer.
As for me, I've been flamed-and I honestly can say that some of the flames have helped my writing somewhat. For example, I pay strict heed to flames accusing me of OOC or rushed scenes, because these kind of flames can often help your weak points-but I ignore flames that are obviously personal attacks on me as a person rather than criticism of my writing. If all someone can say is something like "ur an iddot," I'm not going to worry much.
Yes, I also am a flamer critic: but for specific reasons. I don't just cruise the site looking for fics to slam in the reviews, and I don't outright flame work that just needs minor improvement (usually, in thise cases I do my best to be nice or just ignore it.)
However, I do unrepentantly flame Mary Sues, fics that are so illiterate that they look as if the writer failed grade school, so OOC that the person knows nothing about the characters, PWP fics, or a pairing that completely makes me retch.
So, that's my story: I'd like to hear yours.