fleur: In this thread, ya (and that's what I thought too, at first).
But after doing some looking around, it looks like it's a reference to it being said in at least one other thread.
...oh, wow. It just finally hit. Other cosplays besides Hetalia might be perceived as disrespectful, but... kids dressed up in (as far as the average person would know) Nazi uniforms, posing in front of a WWII memorial? (>.<)'\ *facepalm* That would be the mother of all bad publicity, and could easily go viral.