Filed under well-meaning but ultimately wrong, HuffPo on commiserating by bringing yourself up in conversation:
Sociologist Charles Derber describes this tendency to insert oneself into a conversation as “conversational narcissism.” It’s the desire to take over a conversation, to do most of the talking and to turn the focus of the exchange to yourself. It is often subtle and unconscious. Derber writes that conversational narcissism “is the key manifestation of the dominant attention-getting psychology in America. It occurs in informal conversations among friends, family and co-workers. The profusion of popular literature about listening and the etiquette of managing those who talk constantly about themselves suggests its pervasiveness in everyday life.”
I think it comes from an interest to find common ground with your interlocutor, and it’s innocent–but wrong-headed.