Being based on human opinion instead of actual truths. However, are there any truths to begin with? I doubt it. I personally think that most things will end up subjective, and it's just a spectrum of how "universally agreeable" something is that pulls and pushes things closer and further away from subjectivity.
It will inevitably be the case that most things have some degree of subjectivity towards them. See: Paradox#Subjectivity paradox
You live with N=1, and you also have N=1 brain, so inherently your ideals are the strongest, yet you have to live with it, so people are subjective. You only know your brain - Just a fact
Humans are flawed, their speak is subjective.
Subjectivity means that usually at least there is something that is not
perfectly agreeable meaning there is likely a bit of wrongness.
But talking requires a human body’s subjective perception.
Thus is all knowledge not necessarily true, there be no facts!? But then
just like existentialism, it then recurses back to
"thus we have to make our own meanings" (for words)