Minor spoiler in this reply if you care.
If you DON'T give Baras rude replies you're not a real Sith Warrior.
Or you are a forward thinking Sith Warrior.
It's called the dark side, not the douche side, though they do cross over far more than they should :P.
My Sith Warrior gave polite platitudes, I smiled as I worked out where was the best part of his back to put my saber through.
He is a power and it would be senseless to piss him off for the sake of pride and to exercise a desire for misanthropic discourse with superficial insults.
Like HBNinjax, I got a little more provocative over time as my power waxed and his eventually waned.