FWIW, I'd consider "pro-racism" advocacy trolling, because it's a form of collectivism and inconsistent with liberty.
Racism itself is not inconsistent with liberty. You can hate white people, never talk to them, never hire them, never contract with them, and write books about how evil they are, and at the same time completely adhere to the NAP.
The reason it's inconsistent with liberty is because it's a form of collectivism, which is inconsistent with liberty. When people think in groups, they become less free and they imply that others are and ought to be less free. "What are
we going to do today? What are
they going to do to us if
we do this?" I discovered this while discussing liberty with my uncle, and he recognized the trap he'd set for himself when he joined a specific church congregation. Tying yourself to a community can have this effect.
That's not to say that it's impossible to belong to a collective (see the illibertarian verbiage naturally used when discussing collectives--e.g. "belong?") and be free--it's just harder. Also, collectivism isn't to be confused with free association, because you can associate loosely with others without being part of a collective. I think this desire to loosely associate has been expressed by some in NH, and especially "Free Keene."
In the case of racism, it's the worst kind of collectivism, in which third parties collectivize each other, rather than first parties collectivizing themselves, although that happens too--particularly in prisons and governments and other gangs, and where all sorts of nice people hang out. Note that in these example contexts, people in the collective are virtually always less than free to leave the collective. Frequently, people have to "disappear" to be safe from retaliation for quitting.
Hope that clears up my thinking. I'm pretty serious about it, and I think it's well-thought-out.