> Deth to carless typing, espetillaly on this borad.

I hear ya.

Speaking as someone who, for one reason or the other (e.g. my eclectic education), has never mastered the written form of language to the same extent as my verbal capabilities, I'd say, 'Cut the people some slack!'.
I do strive to get my point across with the minimum amount of textual errors, so if someone is annoyed about the mistakes I've made and disregards the posts I've made because of that, then sod them. I think most do their best to avoid blunders like those stated above, and that's what's important. I, myself, personally, individually, would always be happy to have someone point out my persistent errors (i.e. not typographical mistakes) via PM - others may be offended by this.
It is helpful to bear in mind that on any one occasion where you pick up a piece of published writing, be it a 19th century novel or a current newspaper, you more often than not see something pretty dodgy. And that's after a couple of very qualified people have looked over it!