It's also amazingly ignorant. The entire point of Jim in Huck Finn is the extreme irony between superficiality and reality. Everybody in Huck Finn is horrible, including Huck himself, yet they mostly all paint themselves as the most honorable and just of people - and in most cases probably believe it.

The one exception is Jim who everybody just casually dismisses, yet he's the one truly good hearted and upstanding character in the entire book. It's a lesson about the difference between what people pretend to be like, and what they are really like. Which makes the critiques of the book, often focusing on pejoratives towards Jim, just so unbelievably ironic. It's the deterioration of thinking in society.