Yes, Chinese non-interventionism is justifiable, because George Washington warned the United States from getting too tied up in foreign entanglements. The United States has enough of its own problems that it cannot police the entire world. The United States does not have that much money. It is unlikely that mass intervention into Chinese affairs would end more suffering than it would cause.
Chinese non-intervention is not a solution that the United States can afford to pursue.If people in the United States don't watch out then the Chinese will own every little bit of land and then this country will be more Chinese than American which will take away many of our rights.