Its not about is he better than them or not. Its about recognizing his efforts. Maybe he doesn't have code that can be merged without review but definitely doesn't mean you can discredit or disrespect him and regarding the review part even experienced people end up making mistakes in code. No code is good enough to merge without review, if you are merging anybody's code without review you might be confusing confidence with arrogance. I have worked with huge clients and none of them blindly merge code, and there are managers/seniors who understand you're inexperienced but still treat you with respect, hearing one out and correcting them where they are wrong is the correct way of showing them their immaturity and at the same time helping them grow, not ignoring them or disrespecting them.