Yeah, that was actually what I was thinking of when I mentioned it. A negative reaction to con-crit is frustrating, but understandable -- a negative reaction to positive feedback that just doesn't meet the writer's ideal of what positive feedback should be... whew. I'd just give up at that point.

The problem is that I know for a fact that some readers don't just give up on the particular writer who smacked them down, but give up on sending feedback altogether. It's not just puzzling behavior, but actually destructive.