When Obi-Wan Kenobi and Anakin Skywalker enter the bridge of General Grievous’ ship near the beginning of Star Wars Episode III: Revenge of the Sith, Grievous says
“Ah yes, the negotiator.”
I don’t know if he meant Obi-Wan, Anakin, or maybe even Palpatine, but regardless I don’t understand… Who is the negotiator?
And in fact, there didn't seem to be any negotiating at all, or any plans for there to be any.
The Jedi came to rescue Palpatine, and it seems that they didn't plan to do so peacefully. They entered the ship forcefully after destroying multiple separatist space droids, then immediately fought several battle droids, and killed Count Dooku.
It seems that they never planned to negotiate at all.
Why did he say this line then?