He nodded when the warrior complimented his 'creepyness'. As he was a Sith lord, said part of his personality was a point of pride for Vader.
"I could ask you the same question, mylady. Fetes, as necessary as they sometimes are, are a point of mutual dislike on my part."
While he was speaking he walked closer to the young woman. He could not help but think that such elaborate clothing as she was wearing at the moment did not suit her character. She would probably be more comfortable in heavy battle armour than a pink dress.