In other words, if there is a broad tradition of people saying and writing, "I can do that easy", it is de facto grammatically correct to do so.
In other words, if there is a broad tradition of people saying and writing, "I can do that easy", it is de facto grammatically correct to do so.
But is there? It sounds awful to my ears. Does this not just boil down to the distinction between prescriptive vs descriptive camps?
I believe there is in fact a broad tradition of people saying "I be (going to the store)", but I would say that usage of "be" is incorrect. As well with "I'm gonna ..." or even "Ongonna ...". This type of language can certainly be used "correctly" in prose, to add color and flavor, but I would never expect to see it in a proper non-fiction context.
However, this is an interesting point. Good grammar used to be set by those who who were either educated or at the top of society. There were not many recordings of people using bad grammar, by definition.
Now we have a million recordings of "i can haz cheezburger". I fear that the mechanism you describe - actual recorded use - has been opened by the web to all, and good grammar in times to come may be dictated by YouTube comments.