I checked most of the rude answers and hit the escape key, just to see how funny it was. You will get away with it no matter how rude you are, which doesn't really make sense to me as he's still your master, so you are supposed to owe him respect... and he can choke people via holo
I played both my warriors as being polite to Baras to placate him, while actually lying to him every chance they got.
The only time I was rude to him was when he asked me to (end chapter 2 spoiler)
... and I've been nothing but rude from this point on.
But then again (end class quest spoiler)