> The second was just a instantly-typed reaction which should have been an edit
Honestly, it's an annoying post, and it would be an annoying edit. "OMG WHY ARE PEOPLE DOWNMODDING ME?!" is just really annoying no matter where you put it.
Think about it. How could it possibly inform anyone of anything? "Oh, I never would have noticed that that comment was being down voted if its poster hadn't pointed it out."