a big example we often think of is corporate art.
its very easy to dismiss an advertisement or a big budget blockbuster movie or a theme park ride or memphis style illustrations or a AAA videogame as "not art".
"its not art because the 'wrong' people made it and art is only for the 'right' people'"
in this way if you dislike something and you wish to utterly discredit it, you can simply revoke its arthood. its 'not art', therefore, we dont need to think about it more than that
but i think the more interesting way to look at it is taking it for granted that art is everything made with some aesthetic element in mind, and even stuff made WITHOUT that intention. art is a way of looking at an object, in much the same way trying to measure an object with numbers is.
art is then art even when someone or something we dislike made it. its art as long as there are people who are percieving it as art. propaganda is art.
art is not a bestowal of "good" on a thing. its just a method of object-creation and object-interaction.
and from there, far more interesting questions open up. "whose actual labor went into making this" or "why was this made? what is it trying to convey?" or "how does this make me, the viewer, feel when i see it? why is that?". does it create complicated emotions in you? do you feel unilateral rage at it? do you hate it and wish you could anhililate the entire kars 4 kids jingle off not just the face of the planet, but the cultural memeplex?
i hate art as a signifier of something being "good." both because it shuts down further thought, and because its just a moving goalpost that can be revoked as a weapon, and because bad art exists as much as good art. these things are subjective.
additionally i feel like it just leads to creepy gatekeeping that gives less skilled artists like me who cant draw very good a weird imposter syndrome about even calling ourselves "artists". you must be This Good to use that word.
this is a ludicrous ammount of words just to say "art is subjective and its not really up to individual ppl to declare that something is or isnt art on behalf of everyone"