I have a hack which usually gets such points across efficiently, though:

"How did you - that's exactly, completely what I was thinking! You're totally right!

...(short pause)...

Now put that in parenthesis, and put a minus sign in front. You'll see what I mean."

I'd also add that the whining itself could not possibly have caused the rejection, since you'd have some kind of causal loop.

I agree on the implied denotation that such a general attitude, if applied in other circumstances, would be detrimental. I disagree about the also-implicit conclusion that EphemeralNight does use that attitude in general. Nothing in particular seems to indicate that this person is prone to whining about rejection in general. We've only seen one single instance of some person kicking the soda machine, without knowing about their brother that just got arrested and the 5K$ debt they just learned about - to reuse an old example.