Today, chiasmus is applied fairly broadly to any "criss-cross" structure, although in classical rhetoric it was distinguished from other similar devices, such as the antimetabole. In its classical application, chiasmus would have been used for structures that do not repeat the same words and phrases, but invert a sentence's grammatical structure or ideas. The concept of chiasmus on a higher level, applied to motifs, turns of phrase, or whole passages, is called chiastic structure.

"And the German will not be able to help themselves from imagining the cruelty their brothers endured at our hands, and our boot heels, and the edge of our knives. And the Germans will be sickened by us. And the Germans will talk about us. And the Germans will fear us. And when the Germans close their eyes at night, and their subconscious tortures them for the evil they’ve done, it will be with thoughts of us that it tortures them with." Lieutenant Aldo Raine (Brad Pitt), Inglourious Basterds

So I won't be spending the month of April toasting 50 years of the overopinionated and underinformed little book that put so many people in this unhappy state of grammatical angst. I've spent too much of my scholarly life studying English grammar in a serious way. English syntax is a deep and interesting subject. It is much too important to be reduced to a bunch of trivial don't-do-this prescriptions by a pair of idiosyncratic bumblers who can't even tell when they've broken their own misbegotten rules.

I had to search on the Mozilla add-ons site to actually install this... don't know why.
https://addons.mozilla.org/en-US/firefox/search?q=youtube+comment+snob&cat=all