If only black people liked jazz there wouldn’t be any.
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I’m sorry, but that is just a silly and entirely meaningless comment. Amost as silly and meaningless of the professor’s comments.
Without the support and interest of the white public, there would be no money to pay black jazz musicians. The recording industry provided the jazz musician (black and white) with the means of reaching the mostly white listening audience, which was willing to pay for the music. In the earlier days, white businessmen “exploited” the black musicians by employing them in nightclubs and recording and distributing their music. Therefore, without the attraction to black jazz of white listeners, there wouldn’t have been a market for it.