What is a fan, what is a fan culture, and what is its performance?

The second paragraph describes the causes and effects of fan culture. The influence is divided into two parts: good and bad. Focus on the influence side, such as what is the bad influence.

Finally, I call on everyone to treat idolization rationally and spend their time in important places. At the same time, don't stereotype fans and their culture, but look at their appearance dialectically.