"Interesting that you would say that. I already know far more about you than you know about me. Likewise, I know far more about my world, my universe, than most people do."

Kuja has made his choices, has suffered, has seen many things. Different things, perhaps, but his world has its own shadows. He still can't resist his nature, which is to anger, to pry, sower of discord that he is. Old habits don't pass away easily, but he's making no deliberate attempt to poison anyone's mind. He wants to know more, which is why he is asking.