> Most of it was stylistic nitpicking.

One man's "stylistic nitpicking" is another man's violation of the company's official coding guidelines.

Does the company adopted a linter? If so,why has the new hire not applied it before posting the PR?

Imagine a new hire throwing a hissy fit because even though the whole company writes code in PascalCase he feels that snake_case is better.

Imagine a new hire decided that tabs are better than spaces, and proceeded to reformat 30% of a source file leaving behind wonky indentation.

Shall we tolerate code that has both just so that random internet people in a random online forum can rail against PRs?

Or shall we post a comment in a PR pointing why the code should be reformatted?