I Am the Grammarian About Whom Your Mother Warned You

"Just as there are right and wrong ways of dealing with an angry bear that you meet in the woods, so too are there better and worse ways of dealing with an inveterate corrector of your language use. It has already been established that playing dead is ineffective against this beast. I would suggest instead that you try to fend him off through the use of historical precedent."

Ammon Shea in The New York Times Magazine offers a way to defend oneself against language mavens.