[He's come to accept that his friend is likely humoring him whenever he gets even a half-chortle for one of his quips, but he can't help giving a smile as he proceeds to pour two glasses, expertly passing one his companion's way once he has, giving a faint shake of his head.]

Nonsense— you've no need to thank me. There's always something to be gained by revisiting nearly any subject, especially in such good company.

[That part matters far more to him— but he's always been the type to want to share knowledge, not think less of others for wanting to learn.]

I'd say the company alone makes it a fine use.