I don't hate you (and please don't mischaracterize what I say). Where is this purported acknowledgment that this was a vulnerability? From what I've seen you've completely overstated the case (and I'm not exactly MagicalTux's biggest fan right now). Yes, you just made yourself look like an ass.
I could not confirm or deny that similar trades would execute without possibly committing fraud, so did not try. I explicitly stated this and the possibility that it was just a display bug. I posted (to f-d at least, here soon after) as soon as Tux started responding to me. The text was pre-prepared and not modified. Yes he did tell me that it would be fixed while we were talking.