And black identity is detached from black supremacist ideology? In fact, logic is useful in evaluating the world. All of it.

"Black", in the "African American" sense we're talking about here, is a distinct and coherent culture, ironically one forcibly created by white slave traders who kidnapped Africans and stripped them of their names, languages, and cultures and left them in 19th century North America to build a new one for themselves, which they did. American Black culture includes jazz and (later) hip-hop, the Harlem Renaissance, a huge chunk of 20th century dance, African American Vernacular English, Black churches (and the civil rights movement), soul food, and so on.

Other coherent cultures include the Irish, Italians, Polish, Russians, and, of course, Germans, French, and English. Parades are held for these cultures; entire sections of major cities are named for them, museums are erected for them, &c.

What people on message boards seem to have a problem with is the idea that "Black" is a culture with similar standing to the Irish --- or rather, they'd prefer to believe that there is a coherent "White" culture that functions similar to Black culture. There is not; the suggestion otherwise is literally an expression of anti-Black racism, as you can see from the way "white culture" has gradually co-opted formerly out-grouped Irish, Italian, and Jewish people, in solidarity against integration with Black people.

Nobody seriously protests the South Side Irish Parade (unless they live in Beverly and care about their lawns), the Polish American Museum, or the New York Columbus Day Parade. They do protest parades of "white pride", for reasons I assume are now obvious to you.

There is no point in attempting to argue with racists.

Who's arguing? The question was asked, and I'm answering it. This is like one of the very few social controversies you can resolve axiomatically in an HN comment.

> And black identity is detached from black supremacist ideology?

Yes, it is. Both exist (well, at least black identity and black nationalism do, and that's close enough that I'm not going to quibble about it), but while black nationalism depends on black identity black identity exists and thrives outside of it (and historically does so as a reaction against White anti-Black racist actions and ideology), while White racial identity as opposed to ethnic identities largely does not exist outside of White racism (of which it is also a product, though not, obviously, a reaction against.)

> In fact, logic is useful in evaluating the world.

Logic is useful for evaluating the relationship between abstract concepts, but is only useful for evaluating the world when you join it with all the relevant facts about the world. When you reason about abstractions without facts, or in ways which implicitly make counterfactual assumptions, you reach conclusions that are either without material relevance or incorrect.