First, one need not be an ex-English teacher to know that mastery of spelling and grammar are important. If you haven't mastery of them you have not mastered the language you use to express yourself. It could be an indication that even your ability to understand the written language itself is suspect, something which in your case I do suspect. 
To clarify, something is not a fact if it didn't happen. 
http://www.politifact.com/truth-o-meter/article/2016/feb/09/what-did-hillary-clinton-tell-families-people-who-/