Use their own bullshit against them. Tell them how white people are constantly stealing black people's culture, taking their music, literature, fashion, language, and all their ideas. Tell them how white people raising a fist, and marching for BLM is culture appropriation, that BLM should be a movement for black people only. White people are stealing black peoples' movement, and greedily taking their culture, and power. The white people showing support for BLM are just doing it so that they look good. They're the ones getting all the benefits. Instead of letting black people march on their own, they're taking away the spotlight from people of color. Look at the mainstream media. It's all about white people doing this, and that. Black people aren't being given enough credit for this fight against racism because white people are the ones taking credit, sharing BLM messages on social media, marching, and trying to show the world how good white people are.