Within rocketry, a lot of accusations of copying against China are just hate. The form of rockets is dictated by physics, and so there are only so many ways to approach the same set of constraints and requirements with similar technologies.

Plus, the exterior form of a rocket is the easy part. The engines, plumbing, control systems, and internal structure are the hard part (and also hard to copy part)

Only midwits shun copying. It is good way to learn. It is only bad if you lie about authorship.