In addition to my earlier reflections on the word "art", I want to add one more observation.
Art is, by definition, fake. That is because it is always intentionally created. A painting doesn't paint itself, a sculpture is not naturally formed that way, a performance doesn't occur naturally. Even the presumed artistic work of a serial killer is fake. The deaths did not occur naturally, the bodies did not fall into those positions. So in all cases art cannot apply to the description "real". It is always fake. Would something be real, then it is by definition not art.
Even an audience's reaction is fake, because it is forced. Even though a spectator can respond in a natural way to a piece of art, the reaction would not occur naturally that way, but is evoked by the artwork, therefore not being a natural event, and thus it is fake.
Now some artists want to mimic reality as closely as possible, and even want their art to be perceived as something real. This is then a lie, the audience is swindled. One could debate on the ethics of this.