Someone made a childish and unprofessional critique of the code, and followed it up with a thoughtful and professional response. It's odd that people are okay

Someone made a childish and unprofessional critique of the code, and followed it up with a thoughtful and professional response. It's odd that people are okay with a childish and unprofessional critique of code, but not a fairly civil and well thought-out critique of the "code review."