Contempt and scorn towards the nose flute as an instrument is not new. In this article published in the Portsmouth Times on October 12, 1948, and announcing that the AFM (American federation of Musicians) had finally accepted the harmonica as an instrument, the nose flute clearly is used as an ironic example (remember that at this time, even the ukulele was considered as a toy and was rejected by the AFM).
It had been a long time since the 1925s though, when Lloyd Bufford Threlkeld and other had proved the nose whistle was a real instrument...
I retyped the text, because it is difficult to read, and also on purpose for automatic translators :
Harmonica Makes The Grade - The harmonica has been a mongrel in the family of musical instruments. Favored by the rustics, comedians, eccentrics and idlers, it originally was called Aeolina by Sir Charles Wheatstone who invented it in 1829.
Now the harmonica comes into its own. It is recognized as a full-fledged musical instrument by James Caesar Petrillo of the American Federation of Musicians. Harmonica players will be taken into the union, although Mr. Petrillo concedes he isn't out to organize fence-corner improvisers and players who give train imitations at neighborhood parties.
The reason for the ruling is that, with the ban on new orchestral recordings, harmonica players are cleaning up as recording artists.
If the Harmonicats and kindred contributors to the national culture are succeeded as recording stars by nose-flute artists and virtuosos of the comb and tissue paper, we may look for further additions to the ranks of union musicians.
Earlier or later, the nose flute was regarded as a "joke item" (check this post) or as a "very approximative" instrument (check this post).