I'm a bit of a pedant when it comes to other people's spelling/grammer mistakes. The grocer's apostrophy being my massive bug bear. However, when it comes to my own spelling and grammer, hey, no one's perfect!
Its like driving. If someone cuts me up its because they're an idiot who needs to be strung up. If I cut someone up its because I made a simple mistake and I'm very sorry so please don't get annoyed. Or because they're idiots and shouldn't have got in my way!
My OH is also dyslexic but never uses it as an excuse. He got a 1st for his degree and two prizes and I usually end up asking him how to spell things because he was always aware that he couldn't spell so he worked on it. He's said that if he had a chance to get rid of the dyslexia he wouldn't because he believes sme of the things he's good at are due to it, buit that's another story!