I've had similar "converstaions." One guy was adamant that multihull racing required no tactical skills saing it was just about boat speed (I had just won my class in the Governor's Cup). Of course he had never raced a multihull but he was certainly sure of himself. Arguing this topic is like arguing politics or religion. It takes a true religious experience to get a convert. I offered to "allow" him to crew for me at the next regatta, but he declined. I think he was scared.