The other issue with code review, and I'm glad I've not worked with people like this anymore, for the person being reviewed: NOBODY IS ATTACKING YOU, nobody is saying your code is bad, the goal is to do a once-over for quality.
Another goal people often miss:
It's okay to ask "stupid questions" and I would argue as a Junior, ask away, even if no code changes happen, ASK. Kind of follows the spirit of the original post, which is, can you maintain this?