[It's probably not completely inaccurate to say he is lecturing Naruto. But Neji is good at lecturing people, it's probably one of the reasons he's a jonin.]

As I said. Put yourself in his shoes. A stranger from the future who is...Kakashi's son [He had to calculate that one. The details of Obito's team are vague to him.] arrives with the intention of telling Kakashi that you killed your sensei and his wife, and later go on to start the fifth ninja war and kill hundreds of thousands of ninja. In his position, how might you react? Answer that, and you'll know what to say to him.