meemjar at 4:08PM, Feb. 14, 2017

Vader tolerates terse talk only from those he respects and that's few are far between. Boba Fett is a man who can get the job done when no-one else can. Vader realises that he's too valuable to kill over petty 'lip' and Fett knows it so he's unafraid to spreak plainly to him.