A bull in a China shop : This phrase is an idiom, meaning to behave in a clumsy and rough manner.
If somebody is very rough and works clumsily the whole environment is affected very badly. Things made of china clay are very delicate and gentle. We should handle them very carefully. Imagine a bull entering a shop where wares made of such items are kept. What will be the result? Utter chaos, is it not? Therefore, if somebody rough and tough enters a peaceful atmosphere, he is labelled as a bull in a China shop.
For example: Don't spare the terrorist. He as acted as a bull in a China Shop.
No one like Ravi, he is like a bull in a China shop.
The robber entered the bank like a bull in a China shop.