So on Swagpi's profile it says people would have a breakdown if called a freak and others would somewhat sass them but here's what I would do:

I would stop whatever I was doing, turn to face them, put my hands on my hips and strike a sassy pose, look them up and down, and say "Is there something wrong with being the most powerful Sith Lord in the galexy?" And strut off like I own the place.