I have eventually come to understand (and slowly accept) that I could never sit him down on his own with the book or an on-line course and expect him to do anything with it: what he values is our personal interaction. He's the antithesis of an independent learner - math by Socratic dialogue is more his style.
I'm understanding that difference between my kids, too. DD likes to share the learning, to see a demonstration and have that 'ah-ha!', DS just absorbs what he sees or reads and wants to figure it out himself (give him an overview and he'll go back thru and figure it out). Not that either is hard and fast either way, just overall tendencies.