When I was in middle school, my band teacher taught us split hearing. According to my teacher, a musician should always be able to hear their own instrument in one ear and the band as a whole in the other. A music lesson eventually crossed over into my daily life.
Split hearing is used to hear the conversation I’m having plus the conversations of others around me. I’m sure I can help it, but I’m so used to it that it has become my normal. People are shocked when I repeat their conversations verbatim. Be careful about what you say. Split ears are listening.