>>42447133The use of the word mud as a pejorative does not work when describing a person instead of things like food. You could add a noun to mud to make it work, like puddle.
The correct sentence would be "Why hasn't this puddle of mud not graduated yet?"
While starting the sentence with "just" illustrates your feigned annoyance with mori, I dont think it is necessary. I would also suggest to pick another insult than mud, because it really just doesn't have that certain je-ne-sais-quoi that would fit the frustration you're trying to convey.
