My only advice is to not worry too much about it. One of the first things a new dev needs to learn is how to separate critique of the wok from critique of them as an individual.

IMHO, code reviews should be clear and concise. They aren't a place to go out of your way to soften blows. I expect the same when my code is reviewed.

Edit:

It occurs to me the parent may have been referring to an informal review or one with the intent of mentoring. Asking questions, like the sibling mentioned is a great way. My comment is geared more towards a formal review.