what does this mean?
It means that everyone can have their own opinion on it because there is no absolute truth. You can say "to me this art is trash" but you can't state factually that it is trash because it is not measurable.
Like you could say "this coffee is 130°F", that could be an objective fact. But saying "this coffee is too hot" is subjective.
Personally I have always like the Krooked art style, and it was an influence on me as a teen.
I would never try to convince someone to like some art. It's like trying to convince someone to like a band or genre. People like what the like, and you're not going to reason someone into liking blast beats or something if it's not for them.