For the record, I am not of the mindset that says a writer should never openly question an editor or challenge his/her reason(s) for rejecting a manuscript. That doesn't mean using rude or harsh language but as with any other human being, the decisions are not always respectable. For instance, when someone rejects your work with the terse response, "We don't do fan-fic" for a story that is not even remotely fan fiction, I feel justified in responding.
Do I expect a reply?
Did God have to explain himself to the residents of Sodom & Gomorrah?
Here's what I wrote:
I'm confused by the response. I don't do fan-fic either. No offense, but that seems a tad dismissive. Thanks for the feedback.