Dumbledore is human (or, at least, wizard). He hates Voldemort, who has killed thousands. He has motive to talk to him to keep him there long enough for the Fixed Instant to trap him. The temptation to spend a little of that time insulting Voldemort is too much for even his self control to resist.
Voldemort, by contrast, is just playing with him, letting him waste time till he won't be able to cancel the Fixed Instant, such that when Voldemort grabs the True Cloak of Invisibility Dumbledore will have no choice but to choose who dies forever, the "good Voldemort" or himself. Its very similar to how he toys with Rita Skeeter before murdering her.
I know all that. My point is not that it's out of character for Dumbledore to insult Voldemort. It's the choice of the insult.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 110.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: