Answer a review that calls your PR AI slop

A respected senior engineer rejected your PR with one comment: "This is AI slop. Rewrite it by hand."

The PR adds a Rust parser for a binary wire format, and an assistant wrote most of it. It is correct and tested, and you understand every line. It is also wordy in places and over-commented, and one helper is more generic than it needs to be. The reviewer has started saying the team should ban AI-written code.

How do you handle the PR, and the wider disagreement?