There is a particular power move when you take someone's shit code, refactor it to make it faster, safer and more readable and then request a review from them on your PR. "See how I dunked on you, bitch. This is what superiority is about." And at the same time you can be perfectly polite with "oh you know this part of the code well, I wouldn't want to break anything there" with the "bitch" just strongly implied.