I am what you call a grammar Nazi - - but only in my head. I would never correct anyone's English, except occasionally I will correct my husband's just because I know he doesn't mind. My mother was an English teacher and harped on grammar with me, plus I was raised to be a perfectionist, so I pride myself on pretty decent grammar. I agree that "to" vs. "too" and "there" vs. "there" are pretty basic. I CAN'T STAND IT when someone says "I seen" or uses the word "ain't."