First, fun means spitting, and vulgarity means vulgar hooligans.
Everything has two sides, and the same thing needs to be viewed from different angles. More often, it can reflect people's feelings and thoughts at that time to a certain extent. The interesting content is spitting, that is, saying what you want to say in a humorous way. This doesn't sound embarrassing, it's more difficult for many people.
Vulgar is vulgar taste, vulgar rascal. That is, as soon as you open your mouth, it is related to the following three ways, either yellow, violent or embarrassing, and so on. Vulgar content is very easy to distinguish, swearing, unpleasant to listen to, contrary to the secular three views, swearing when something happens.
Second, grasp the dividing line between vulgarity and fun.
There is often a thin line between taste and vulgarity. Low-level taste can easily become vulgar, while vulgar content, though interesting, can't really play any educational role. This degree is difficult for many people to master and will gradually change from interesting to vulgar. There are also many performers who excessively engage in some vulgar content in order to attract the audience. Therefore, fun is difficult, and the key is to master this degree to prevent fun from becoming vulgar. This is also the reason why many talk show actors say that their jokes are more advanced, and it is also because they make this very interesting, rare and powerful in the process of educating people.