As others have noted, there is simply no organized mechanism for "banning" a song from radio airplay in the US. We don't have a Ministry of Information that sends men in black suits to enforce radio playlists. While it is conceivable that the corporate moneymongers at Clear Channel (which owns a bunch of big commercial stations) could decide not to play a given song, they have no control over anything outside their commercial empire, such as college stations, public radio, and independent broadcasters.