Is it impolite to have a black expression on your face?

Politeness depends on the occasion and the way of use.

It is considered impolite to use black-faced expression packs in formal occasions or when communicating with strangers. Because it usually has a silent ridicule or dissatisfaction, it will leave people with the impression of disrespect or indifference.

But in informal chat or social media, it is more acceptable to use a bad face expression pack. Because it can be used in relaxed conversations and express your feelings in a humorous way. In this case, using black-faced emoticons is not considered impolite, but a way to interact with friends or acquaintances.