Unlike Batgirl, I thought the title of the thread was using "Nazi" in the trendy way as short hand for jerks who try to impose their sense of the proper on everyone else. But I'm much influenced by the Seinfeld episode featuring the incomparable Soup Nazi. ("No soup for you!!")
I agree with Batgirl that "Nazi" is not a particularly apt term here. I think the closest analogy is the self-appointed "grammar" experts who inflicted on us such rules as never splitting infinitives and never ending a sentence with a preposition. (That last, to paraphrase Winston Churchill, is a rule up with which I will not put.)
I'm not sure what phrase conveys this sort of mentality clearly.
I'm sure the Greeks have a word that would work. Those guys had a word for everything. :)
Wow.... I've learned 2 new words thanks to wormrose and batgirl... frippery and bagatelle. Oh and by the way... thanks for this thread Popinjay... we've all learned so much from it. Perhaps the best term for this would be Chess Police... and maybe they hang out with the Forum Police eating donuts or is it doughnuts?