Grammar Nazi. 
GrammarIn linguistics, grammar is the set of structural rules that govern the composition of sentences, phrases, and words in any given natural language.
SpellingSpelling is the writing of one or more words with letters and diacritics. In addition, the term often but not always means an accepted standard spelling or the process of naming the letters.
Thus Mr. Dot Grizz would be a Spelling Nazi, not as you alledge a Grammar Nazi!
just saying......... Discuss Pls