"There's a hole in your bedroom wall the size of my fist, yet you're taking the time to treat my injuries. It's contradictory. You ought to be withholding treatment."

Not that he needs it or is complaining, he's just confused. Vegeta has a hard time discerning what she wants from him, something he finds as frustrating as it is fascinating. It's been a long time since someone's been able to elude him with their intentions before -- or, perhaps, it's that he's never really encountered anyone who's shown him any measure of real kindness. It's baffling.