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Do you really think so? Does that really sound like something that Dumbledore would do? He seems to keep fairly civil with Voldemort when he's talking to him, speaking calmly and calling him Tom, doesn't seem like he would lie just to unnerve Voldemort - sounds too much like unfair play. That would be a bit of a cheap shot if it was true, and that's not really very characteristic of Dumbledore. And as we see, Voldemort isn't bothered about this in the slightest, and if Dumbledore thought he would be, then Dumbledore would be wrong about Voldemort which he isn't usually
You dont think that sounds like dumbledore? I think that sounds exactly like something dumbledore would do. Its not unfair in anyway, its just a little intimidation. Also, we don't know if it unnerved voldemort or not; he's not going to show that hes a little scared or nervous in front of dumbledore, he was putting up a front. On that same note dumbledore was almost definitely doing the same thing. Yes, he seemed very calm as if he were just playing around, bbut im sure he was extremely focused and on his toes ready for anything that could happen. And as for him thinking he could beat voldemort in a duel, he knows he wont be able to kill voldemort and if he captured him voldemort would almost definitely escape within days.
As for what
Sister to the Dark Lord said, i think i agree. Dumbledore probably told an order member (such as kingsley, who works at the ministry) to tip off the aurors that voldy was at the ministry while not mentioning dumbledore was there too.