The issue with "anti-racist activism" is that it is often based off of explicitly racist ideals. Many of the protests and arguments are built off the back of the idea that someone is a victim and someone is an aggressor. Someone is innocent, someone is guilty. Someone is the enemy, and the enemy is anyone not like you. The "fight fire with fire" approach rarely works and it is rare for equality to be achieved by lessening someone else's worth. Ideally, those who are disadvantaged would be raised to equal footing instead of the power dynamic being switched around. You don't fight back against racism by openly saying there should be less white people, or that white people need to be taken down a peg because of their original sin, or that the opinion of a white person is less than that of someone who falls within a "diverse" background.
I'm taking the line that current accepted methods of fighting back against racism generate more racism. Racism was already there. They're just making it worse (from both sides).