I think this approach only works if you're already too hard on yourself. If you live like a slob and tell yourself to continue living like a slob then it's not going to help you much.
You can alternatively decide that despite the fact that you "live like a slob" you are sufficiently happy, healthy, and productive. And that the standard that says "this is slobbery" (which comes from projecting an external viewpoint) is not relevant to you, so you can ignore it.
(You can also substitute any X, where X is not harmful behavior, for "slobbery".)
