This is one of my pit falls and I've been verbally harassed about it. (Not on E) So in my experience the people my misspellings have turned away where probably not worth playing with.
I don't believe I have dyslexia, I was tested for it when I was a teenager but they said I didn't have it and I don't like to self-diagnose. My problem is that my resource for grammar knowledge is like a full bucket of water. If I want to learn something new like how to use "Your" properly, I have to forget Dominant. Its funny that I can retain other knowledge fairly easy, but in grammar I struggle. Some times I feel like the Ice King, trapped in a labyrinth of my own mind and with no hope of ever escaping.
As difficult as it is having less resources then some of the other writers, you make do. While my spelling is atrocious, I have had the pleasure of role playing with many great writers here and else where who are able to forgive me. So I don't believe it is a big problem.