There is a huge difference between the two parties in how to deal with racism.
With one party, the focus is on race, it is what Rush attempted to make fun of but wound up stepping in. That party thinks that we should divide people up into each ethnicity, gender, sexual preference and whatever further divide we can come up with and make laws regarding how they should be treated at all times.
In the other party, the focus is to look in other directions than separation and division to bring us together in a society that can finally conquer the inane "racism" that hounds us. They believe that focusing on race can only make us continue to focus on our differences rather than what brings us together or finding what can bring us together.
When somebody takes the focus away from that, and brings it back to the party being "whites with attitude" for the other side, they need to have some counsel whispered in their ear. This isn't what we aim for, rather than support and bring them their bath water we should try to re-aim the party towards the goal.
Well at least you backed off assigning him a false motive for playing the song.