Well... I'm in school. And I don't type like that, though I'm probably the only person I know who doesn't. Fortunately, my language arts teacher is fairly strict about people not using chatspeak, bad grammar, unnecessary abbreviations, etc.
If I ever turned in a paper written in that sort of a style, I doubt that I'd get a passing grade on it.
Grown-ups never understand anything for themselves, and it is tiresome for children to be always and forever explaining things to them.
Antoine de Saint-Exupery, "The Little Prince", 1943