I have two major rules that address these: The first is that code review comments are leaping off points for discussion, and filling in the space next to the c

I have two major rules that address these: The first is that code review comments are leaping off points for discussion, and filling in the space next to the comment with a justification is a valid fix. (And "I don't understand this" is a valid comment) This helps equalise the two roles, and makes it just as valid for a junior to review a senior's code, and avoids artificially limiting who can review any piece of code. The second is that everybody reviews everybody else's code regularly. The source of people taking them personally (in my experience) are people who haven't had their code reviewed in a while or having the same people do all the reviewing.