Okay. My mom's boyfriend and his daughter are very competitive about everything. They go on about how good they are and how I suck. They even laugh when I make simple mistakes. I need your help. What would be an intelligent, mature response to any competitive remark. Like, what could I say that will make them think twice about their behavior? I am not friends with either one of them, so I won't try to go soft on them. I just need an intelligent, mature response to their behavior. Any suggestions?