Huck Finn was written by Mark Twain (yes, that's a pen name, but that's got nothing to do with this) using nonstandard grammar consistently throughout, to evoke more clearly the first-person image of an undereducated writer, the teen title character. The book got a LOT of negative criticism in its time for this.
Today, we have 'standard nonstandard' usages, including but not limited to the Scottish accent preferred by @Faur
, the dentalised lisp I keep getting into trouble for (Some words, dey hard to say wif my mouf.)* and of course, things like Jaeger-speak.
Here's a recent panel of a webcomic that illustrates that one:
I'm tired of relying on people telling me privately, 'This is good!' or 'This is bad, we don't want it here.' Both of those are valid views, my problem is that I don't know which one speaks for most of us.
This poll is anonymous.
*I keep getting pressured into not using it. Sometimes I cave.
Some words, dey hard to say wif my mouf.