Typos I can excuse. But because I edit other people's papers frequently, I have become anal about spelling and all points of grammar. This shows when I post on GC, because I will have to edit anything that is not perfect to me. I read one of my posts from a few years ago recently and was amazed that I spelled a word wrong & did not catch it.
My husband always talks about the love letter he sent me when we were dating that I edited and gave back to him to rewrite. How was I supposed to know that 15 years later, I would still be editing his papers?