Arrogance does not need to be a by-product of intelligence. When I was young, holding my intelligence before me I told the world who it was. That does not last forever, as your retired colleague knows full well, the more you learn, the more you realize you do not know, and you probably never will. You can listen to anomalies and eventually confront them, and you can say yes, the earth operates like it is flat even though it isn’t but I have a formula for that.
And no I do not play chess. It bored my intellect.