Bad guys brag about how badass they are and how outclassed the hero is all the time, even if the person they're facing already knows them. It's common enough that TVTropes has a long list of examples. In the Star Wars setting itself, consider Luke's confrontation with Palpatine. Palpatine goes on and on and on about how Luke only has to give in to his hatred to turn to the Dark Side, which Luke already knows, and how doomed his friends are because Papaltine has planned everything, which Luke by this point also already knows, but Papa Palps won't freaking shut up about it.

Bad guys brag about how badass they are and how outclassed the hero is all the time, even if the person they're facing already knows them. It's common enough that TVTropes has a long list of examples. In the Star Wars setting itself, consider Luke's confrontation with Palpatine. Palpatine goes on and on and on about how Luke only has to give in to his hatred to turn to the Dark Side, which Luke already knows, and how doomed his friends are because Palpatine has planned everything, which Luke by this point also already knows, but Papa Palps won't freaking shut up about it.