No, collision and interception are common tactics used in maritime law enforcement, at least in the East China Sea and the South China Sea. CCG has been ramming with the Japan Coast Guard for quiet some time. Such squeeze-water cannon-collision tactic is actually very effective in SCS over the past year.
PCG's larger ships, like those 1,000-2,500-ton patrol ships, no longer dare to approach, allowing CCG and PLAN to effectively control Huangyan.
It can even be said that PCG's use of small and fast 100-ton patrol ships is due to necessity. Just because an accident and the fact that CCG cannot deploy enough patrol boats to counter the PCG patrol boats due to range constraints, it does not mean that the tactics themselves are completely wrong.