Experts at creating "jingles" for advertisements have to get tunes out of their head all the time :-) and they say there's really only two ways; either substitute another song or play the song through to the end and give it closure.

Do the same with the thought, take it to it's logical conclusion or keep replacing it with another thought; maybe think about what you'll have for dinner or breakfast in the morning, etc. or read and wonder something about what you're reading. The mind can only think of one thing at once and will eventually give up if you keep bringing it back to a "new" thought rather than the disturbing one. I would also try "agreeing" with the thought. If you agree with argumentative people in some way, "you may be right" or "I see what you mean" they have nowhere to go with the argument and it ceases. Do the same with the thought, have a pleasant conversation with it, tell it how much you've enjoyed having it, give it your full attention and it will have to "give up" the space.