Maybe the lesson here isn't that people who don't play video games are stupid, but that people who do play them need to learn patience. Maybe it's all the people getting frustrated and calling him mentally challenged who need to take a step back, take a humble pill, and try to see something from another perspective than their own, hmm?
Is it really that frustrating to watch? It's someone genuinely interested in trying out and learning about something completely alien to them, that means a lot to us, and learning quite quickly. It's understanding where the intuitive flaws lie in the games we play, about what assumptions we make, and it's also a tribute to Valve for creating something that can be enjoyed even by people who doesn't already know all this.
I didn't find it frustrating at all, I found it inspirational, but if it really is that frustrating, maybe we still need to learn to stick it out. I know you all think you're the most brilliant people on the planet, but put yourself in his shoes. Something completely alien to you, the ur-example being a father figure explaining the intricacies of sports. Most of you would give up after less than five minutes, calling the whole hobby stupid, the rules stupid, and arrogantly think you're "above" such things.
Think of the news of this article as the lesson about humility he can teach us all. That might be nice, and if we take it to heart, it might make the gaming community much more pleasant, not only to newcomers and outsiders, but between gamers as well.