In contrast to the U.S.? When other countries did this in the past and present, it was ok, but not for China? The U.S. can invade and occupy countries on the other side of the world, but it's aggressive for China to occupy an unoccupied island off its own coast?
I'm not thrilled with China's behavior, but the U.S. needs to stand down until they can act from the high moral ground. They have a lot of work to do to rebuild a working compass. Until then, nobody can trust their navigation.