Cards require a certain camaraderie which at current, the two of you lack, and thus will either devolve into awkwardness or, potentially, competitiveness. While that could have a positive affect, and of course I don't object to it as that would be ridiculous... a lesson would allow him to share something he loves with you, and change the context of your focus on him to one where you are watching him, something he also loves, but in doing something positive and constructive and even, yes, beneficial to you. It is a chance for him to give to others that is not 'taken' from him, and he will be comfortable as the expert in the situation and thus less prone to cattiness and ill-temper.

The short answer: lessons contain the largest number of positive factors that may lead towards a successful interaction. Baring, of course... your own discomfort. No plan goes to action unchanged, after all.