There is no need to make racist generalizations. You could just limit your criticism to social justice activists.
2. There is no evidence that white people have institutional power over people of other races. This is a baseless assertion that forms the basis of a left-wing racial victimhood dogma.
3. It's also irrelevant. It's not the word "racism" that makes what you're doing bad. It's the fact that you're negatively generalizing people based on a single superficial dimension of their personage. It's bigotry, that disparages people based on something they have no control over, no matter if you want to engage in mental gymnastics to claim it's not "racism".