Basically, your reviewer is totally missing context, and it is your pull request's job to give them that context. You have a few options:
On Empathy & Pull Requests
Slack Engineering
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This is almost always the case- lack of context was always a problem in our code review process. We’ve fixed it with introduction of pull request templates (https://medium.com/@k.szromek/how-my-mom-helped-my-team-with-pull-requests-reviewing-1139f39aa775). Have you tried that?

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