Setting makes a difference. At daycare, he has other kids to play with and different stuff to drive the trucks over.

This is a bit of a self jab. The kid didn't want to play with the toy, he wanted to play with you.

Doesn’t this tell us more about the parents?

Maybe there's someone he's trying to impress with the truck. Isn't that why guys drive trucks?

Using the word "refused" assigns negative intent to the kid. And maybe the kid did refuse("I don't like those toys"), but I find that unlikely it they started playing with them at daycare. Maybe there are toys at home they prefer. Maybe, as others have stated, its more of an environment thing. Most kids, even when they start to be conversational, lack the vocabulary to fully express themselves. They learn to say what they don't like earlier than saying what they do like, and will often use black/white terminology even when the feeling is more nuanced.