Ive been doing it for a while now too, with great results.

Bonus points if the thing done is impossible to be racist, so your friend objects, but you point out that it was done by a white person and then launch into the "you have to do better" / "all whites are racist" crap, which they hadnt actually heard before, then you whip out a phone and prove to them that people are really saying that.

So many dropped jaws that i could not have achieved by starting a political conversation!