The direct translation of “扣帽子” is “put a hat on someone”. it means labelling someone. It is a typical attack on language which makes negative impression to people who do not know something  very clearly. As the Internet has become an important place for people to receive and express their opinions. Now it is full of arguments. The internet is always divided into small groups with different views and hobbies. These arguments are often focused on areas such as games, fan clubs, regional culture and gender. People are often complex, but the expression of views on the Internet is always straightforward, and in these arguments, negative labelling online has become a common practice.