I'm not dyslexic, but I've also experienced a similar attitude towards spelling. It's something I've always struggled with (I tend to think faster than I write, so frequently muddle words together, and words tend to 'look fine' even if I know the correct spelling - writing this I typed 'thinker' instead of 'think faster', and something like 'wierd' wouldn't stand out to me without spell-check). Fortunately it's never held me back, and deson't effect, e.g., reading, but I've definitely encountered people with an attitude along the lines of "You can't spell, therefore are an idiot" which can be fustrating.