-Saying Australia are scared of the US/competing and that they should have stayed home (via retweet).
-Implicitly having a dig at the guards playing ahead of Exum when he said Australia was wasting the talent they had.
Even Bogut, who is pretty outspoken, wouldn't outwardly say that kind of stuff about his own teammates.
Australia obviously are scared of the US, hence throwing todays game.
He's friends with Exum and wants to see his friend play because he thinks he can contribute, that's not taking a shot at anybody that's supporting a mate.