Here's a little video for you to clarify the difference between objective and subjective. The monotone narrator is slightly sleep inducing, but if you listen to what she's saying it's fascinating. My favorite line is "a cougar clawing at your brain."
So, placement of quotation marks, commas, verb tense matching and parts of speech are all objective things. There are rules that define them.
The way a writer arranges words on the page are subjective simply because our personal experiences and perceptions affect how we receive them.