The only time I type like that is when I'm poking fun at the people that do type like that. :P

There's really no reason not to use decent spelling and grammar. Yeah, on occasion I'll use the wrong word or make an accidental mistake, but typing like garbage on purpose actually takes more effort than just typing it properly. And honestly, typing like garbage doesn't make for quality humor anyway. It's old, cheesy, and it's been overdone.