Right on. One of my workmates is dyslexic and he tells me that because of this he always makes a special effort with his writing, not just using a spellchecker but checking it himself and not just for spelling. He won't send an email or letter etc without being reasonably sure it's in good order.
His written work is, perhaps not surprisingly, better than almost anyone's. I like this about him. Rather than hide behind his limitations, he challenged himself to understand and surpass them. It sounds like you do the same.
Stu
My boss is very dyslexic, and I'm often called in to proof read for him, because he knows he won't spot his own mistakes. Our circular letters to households are generally more mistake-free than the council ones!
He's learned to be wary of spellcheckers and auto correct too. The other day he sent me a text saying we'd been asked to collect 5000 orphans from a beer festival. He meant 'programs', but his phone had auto corrected it for some reason!
As for noticing mistakes, yes, I do, and they do grate, but I've learned to let them pass most of the time. If the meaning is clear, fine. A forum like this is a place to chat, and in spoken chat, we can afford to be relaxed.
In spoken English, I actually quite enjoy some of the variety of usage, it's part of the variety of the country. I think I'd draw a line between people using English casually when they have something to say, and people speaking for the sake of speaking and having to fill in with 'like' and 'innit' and 'know what I mean' just to expand a sentence.
But we can't help making value judgements about people based on their use of language. I sat in a meeting at work on Monday, where we all had to introduce ourselves. Halfway round, one man, who I'd never met before, pointedly introduced himself as
Dr X*. Now, it's true, he may have been the only person in the room with a doctorate, but he was certainly the only person who felt the need to use a title, and one intended to impress. My immediate impression was "Oh, you're a pompous little git aren't you?" and by heck, I was proved right!
*Not really X of course, although that might have made him more interesting.
Tricky business.. 
