I think that many of you are selfcongratulating ....and a bit pompous.
My ds is dyslexic. The "obviously the poor speller isn't smart enough to wipe his nose" lot of you are as naive as I was before he was diagnosed.
He spells many words incorrectly but when he was 8, his verbal IQ was age 14. (He's intelligent).
I also have dyslexia but I was taught with different standards so I am a very good speller. Neither of us can remember things by rote. We don't know multiplication tables! But understand the concept.
My ds is remarkably smart in many things. His grandfather couldn't spell either, but he was a chemical engineer. His father is an electrical engineer who builds circuit boards from scratch. Can't spell.
Spelling means you can remember letters that make words. It may indicate that you're smart. But not spelling words correctly doesn't mean you're stupid.
Until spelling is not the standard by which we're judged intelligent, dyslexics will be considered stupid. Which is sad, bc we aren't stupid.