I really don't think it is, it's not a negative thing, just a different thing. It sounds as if it dis-ables you in some way, but it does not. I get what being disabled is, my step Dad has MS and is disabled as he needs a wheelchair and other things to get around. It's not a mental dis-ablement either, it's just the way the brain is wired and how it processes things, it is not a disability. Just because it's different from the norm does not make it a disability.
I just get fed up of the negativity to dyslexia and the presumption you are thick.