If you also add "and any coding style things you care about, you have to make the linter check for", then you don't have to waste any time on that stuff in the pull request.
GitLab B.V. CEO here. Totally agree that lint errors should fail the build instead of commenting. Otherwise all the people /cc't in the pull/merge request get all the hound comments in their email. And the nice thing about Rubocop https://github.com/bbatsov/rubocop is that you can disable tests easily. With GitLab we initially had: 406 files inspected, 1609 offenses detected. But after selecting only the most important checks and a day of fixing we got a green build.