My son has a form of dyslexia called dyseidesia that prevents him from being able to spell because he can't visualize the word. He can only spell phonetically. We didn't know he had it until last year (at age 12), but before that, he used to drive his teachers nuts because he'd write entire essays phonetically. One teacher, in second grade, got very frustrated with him and he told her "I don't care about spelling! I'll just use the spell-checker!"
I was mortified because he'd paraphrased me. I'd told him previously to do the best he could with spelling, but not to get upset or frustrated with it because some people just weren't good spellers and there was always spell-checker.