I love Baras, he's possibly the best character I've encountered in the game. He can even be kinda intimidating once you get over his body size.
But yeah, I give him rude replies every time I can, I don't ever kiss up, and some of his reactions to my taunts are awesome. His voice actor is fantastic. He just nails it, and I can say many of his lines by heart.
"I wouldn't regret destroying you where you stand"