I think there are subjective and objective elements.

Kinda like food. People can say, hey I like the taste of McDonald's hamburgers, and you can't argue with that. But then you compare that to a home-grilled burger with nice fresh toppings, and I think most people would say that is objectively better than a McDonald's burger with one pickle and a squirt of mustard that's been sitting under a heat lamp for eight hours.

So people can like, say, "Baby Shark" as a fun catchy tune. But I can point to objective facts about melody, tone, complexity, thematics, etc. that makes a Mozart concerto better than Baby Shark.

So "what people like" is totally subjective. But "what is good and what is not good" is more objective.