As writers and reviewers, everyone takes fire. Whether it be flames, trolls, etc. It's practically inevitable. If someone doesn't like your writing, they'll most likely state a few insulting comments and leave. This also applies to reviewing, as if you post an "insulting" quote/unquote review, you will inevitably be scrutinized by its fans.
So the question stands, how do you handle that situation? Do you simply ignore it and keep on doing as you do, or do you answer back?