TBH "grammar nazi" is probably the kindest common use of "nazi" I can think of, wherein it means (in context): "one who strictly adheres to the perceived gramma

TBH "grammar nazi" is probably the kindest common use of "nazi" I can think of, wherein it means (in context): "one who strictly adheres to the perceived grammatical rules of the used language" or something close to that. Calling someone a "grammar nazi" is far softer in result than calling someone an "actual nazi" (usually).