My responses if this were me there:
Part 1: ...Did you just call my little angel stupid...?
Part 2: Oh, it's coffee you want, huh? Well then...Here you go!
Part 3: You want me to answer the phone? HERE'S MY ANSWER!
Part 4: Oh, I'm just gettin' started...I'm listening...Is that so...? Better...You don't say...You can do better then that...YOU'RE A PECKERHEAD! That lowers the bar a bit from the previous offer...You already tried that.
Part 5: Shut up, you little brown noser! Besides, that was Henderson!
Part 6: Pick your next words wisely...Bat choise, but here you go!
Part 7: I quit three weeks ago when I realised my dream job as a hitman!
Part 8: ...Nah, I was paid extra for offing you along with him!