Can I ask a really strange, and possibly really stupid question? It's more about manners than writing, I think, but I'm going to ask it anyway, because I don't know who else to ask.
A while back, I sent a short story out to several markets. I got the usual rejections. but one stood out. The letter itself was a standard "Thanks but no thanks" form letter. But at the bottom, the editor had written nearly two paragraphs by hand. She said she absolutely loved the story and thought I had a terrific voice. The only reason they were rejecting it was because they had just done a couple other stories on nearly the same subject/style, and were unwilling to publish a third. She said very emphatically to please send along my next offering, and moreover, suggested a couple markets who might very well buy the story they were rejecting (and one did!)
I framed that rejection and it now hangs on my bedroom wall (where my computer is). It was the coolest, most confidence-inspiring rejection I ever got. How's that for an oxymoron? I couldn't afford to fly to New York and kiss that editor for that little note (besides, she might have thought that was pretty damned weird).
So for all that build-up, what is the question? The question is, would it have been inappropriate to send her a thank-you note? I didn't, because i was afraid either A) she wouldn't remember me or the story, or B) she'd think I was being hateful or angry about the rejection and the note was my way of being snarky.
Like I said, stupid question. But, being a Southern girl steeped in the "death before bad manners" lifestyle, it's one I'd like to know. If an editor gives you a nice rejection like that, or takes the trouble to ask for the entire manuscript -- whether or not they eventually accept -- is it wrong/stupid/a waste of money and time to say thank you for their efforts?