Simply because we are editors, that does not mean we are, or should be, “grammar nazis.”
While I do get a laugh at those grammar arguments that sometimes get surprisingly heated, I find that I usually have a side. We can get into a whole descriptivist vs. prescriptivist argument. This quote, from the late Joseph M. Williams, pretty much sums up my feelings:
“If writers whom we judge to be competent regularly violate some alleged rule and most careful readers never notice, then the rule has no force. In those cases, it is not writers who should change their usage, but grammarians who should change their rules.” -Joseph M. Williams, Style: Lessons in Clarity and Grace.