What if the reviewer gives you bad reviews that lead to bad code, and you can't defend because he couldn't understand the shit you're talking about?

Then you possibly dodged a bullet.

Fortunately I can ignore reviewer's comments leading to "not better" code if the reviewer can't explain why the changes suggested by him are better. But it happens rarely.

Benchmarks.

Compare their implementation against yours. If your code has a smaller memory footprint, and executes faster, they'll be more inclined to give a reason why they insist on the change.
Sometimes it's something like "this is done this way to conform to our internal style guidelines "
Or, they'll say, "oh shit, you're right. Your way -is- superior "