The comments folks are making about “inappropriate stuff” or “obsessively talking about an interest” don’t really describe this young man. I think he certainly has some interests - like trying to solve algebraic equations for fun, or creating a formula to solve Rubiks cube or researching and trying a zillion hot sauces - but he doesn’t bore others with them.
He is very sociable with his friends, however he NEVER, and I mean NEVER, initiates plans. He does a lot socially, but it is always at the behest of a friend who suggests golf, movie, etc etc