Newmark’s Door: points to an article indicating that the attribution of “This is the kind of nonsense up with which I will not put” to Winston Churchill is incorrect. Incorrect or not, it is enduring because it rings true as exactly the sort of response Churchill would have made. As it turns out, Churchill’s point wouldn’t have just been that the critic was silly but that the critic was, in fact, wrong; the injunction to ‘never’ end a sentence with a preposition is incorrect. Don’t take my word for it.
Postscript: Lacking a category for grammar, I recalled that Churchill’s mother was an American and that Churchill was hinmself an honorary citizen of the US and entered this as “Americana”.