Totally agreed, taking in a different POV than your established one, is always a good thing.
That's what I meant though, you can tell when a person has dyslexia when you are talking to them - OK, I probably couldn't, since I haven't educated myself on it. But after having read 1 post, I would think it kind of hard. (Sorry, since I don't know the post you speak of, I can only assume it was one of the poster's very first.)
As to why people jump on the occasion to correct somebody's spelling when the post is still coherent and clear... Guess that says more about the corrector than the correctee.
grrrrr... another edit
thesupermikey: That, I think we are all a victim off... When you wrote something, it *is* hard to find the errors.