Malacañang shrugged off China’s harassment of Filipino-manned vessel. Why is this concerning?

Excerpt
In a move seen as a refusal to reinforce the maritime rights in the West Philippine Sea, Malacañang dismissed the harassment of a Filipino-manned vessel by a Chinese ship even if it happened within Philippines’ exclusive economic zone.
The vessel called Green Aura is not Filipino-owned. It came from Greece and carried a flag of Liberia. Filipino seafarers, however, comprise its crew. At the helm was Capt. Manolo Ebora, a Philippine Navy reservist with the rank of lieutenant commander.