Yeah, maybe? IDK. His father is apparently just the same - they're apparently very similar in terms of athletic ability and personality. I think a lot of people have the grammar they grew up hearing and the grammar they use in more formal settings, and he sounds like he has problems switching a bit (or doesn't care to switch) between them.

But I also think this is something I'm more sensitive to, since I code switch a whole whole lot, and so am perhaps projecting my experience onto him.