I "Am Very Open-minded"

The standards we choose to judge things by are subjectively chosen.
e.g. originality isn't objectively any more important/valuable than borrowing other's ideas and recycling it, but we choose to value originality and give it more weight.

But even if those standards happened to be objective, humans are the ones doing the judging and it's ultimately going to end up being judged subjectively. For some things like an algebraic equation, it's a lot easier to judge it specifically because there is a specific answer one is looking for which can be mathematically correct or incorrect. For other things, it's harder because what one person considers to be concise, another considers to be lacking in detail.

There isn't anything anyone can agree on and it's not just because they're willfully being obtuse or lack common sense. It's not because of any reason one can hand-wave or argue away (such as being crazy or arrogant or immoral or stupid). It's just because they legitimately view things differently, even on topics one with a socially-accepted view thinks should be universal.