The last Mencken post

A Variety headline:

Pash Flaps M. C.
Fan Clubs Rated
Worthless to Theatres
As B. O. Gag.

Quoted in H. L. Mencken, The American Language: An Inquiry into the Development of English in the United States , 4th ed. (New York: Alfred A. Knopf, 1936).

Can you figure out what this headline is saying? Mencken gives a paraphrase as it appeared in the Manchester Guardian , January 30, 1930. No spoilers here: it’s in the comments.

Also from The American Language
The American a : The American v. the Englishman : Anglic : “Are you a speed-cop?” : Benjamin Franklin and spelling : B.V.D. : English American English : Franco-American : “[N]o faculty so weak as the English faculty” : On professor : Playing policy : Proper names in America : “There are words enough already” : The -thon , dancing and walking Through -thing and -thin’ : Vaudevillians at play : The verb to contact

[Finally made it to the end of this book.]