And, may I ask, when did White music being influenced by Black music start being reprehensable? If Barbershop was, in fact, a White reaction to Black close harmony, we are the richer for it. Afrocentric musical influence has reshaped the face of American music since the mid 19th century.
And, when it comes to integration, I know a lot more Black Barbershoppers than I do Black bluegrassers. Come to think of it, the Black contingent among singer/songwriters is kind of srarce, too.
The last big folk stars, of color, were Harry Belafonte and Josh White. The fact is that folk scene has never been popular in the Black community (Check the audience at a Doc Watson concert).
So, love Barbershop or hate it, but don't go on a racism rant. Barbershop choruses are unrestricted and more integrated than you think.