User blog comment:Darkcloud1111/Good Idea, Bad Idea~Dance Dance Infiltration/@comment-10380701-20140915050010

I think the implication with Neptune is that he wants to look cool to girls.

Meanwhile, to other guys, he's such a cool guy wannabe. As Sun is a longtime friend, he's already rather comfortable with him.

So his interaction with Jaune is him opening up instantly once Jaune snapped at him regarding Weiss. He can't walk the talk.