I think both of you failed to learn from each other there. He had an opportunity to learn from you but refused it. For me, every person presents an opportunity to learn, but I maintain a filter for each person because there are varying levels of bullshit and presence of a little knowledge about certain things. I consider it one of my talents that I can quickly and effortlessly gauge these levels for people and discover what it is I can learn from them and what I definitely can't learn from them.