It is worth remembering that code reviews are aimed at the overall quality of code in keeping with the company's guidelines. Feedback, therefore, should be constructive and not used as an excuse to put down or embarrass a fellow colleague. Similarly, reviewer feedback should not be taken personally and responses to the reviewer should focus on suitable action and explanation.
The following diagram shows the process of issuing a Pull Request (PR), performing a code review, and either accepting or rejecting the PR:
Providing feedback as a reviewer
Workplace bullying can be a problem, and programming environments are not immune. Nobody likes a cocky programmer who thinks they are big. So, it is important that the reviewer has good soft skills and is very diplomatic. Bear in mind that some people can easily be offended and take things the wrong way. So know who you are dealing with...