You were part of WxS. And you were undoubtedly a traumatised little shell of a person. Rui had recently met your family, and even he was creeped out. They blatantly brainwashed you, no matter who watched. A few minutes ago, your big sister started showing up at the wonderstage and yelling at everyone, implying they're a bad influence. And Rui has had enough. "...Hey. I don't see how we're a bad influence. If anything.. you are a bad sister."