I don't consider such things genuine ideas, only memes. They are not complete ideas because they need to draw upon other ideas to instantiate themselves into something that really contains meaning.
Racism is not a conceptual framework with content. Races don't really exist, we draw upon some biological markers to define 'our own' and we make up reasons that those biological markers should be preferred. So German racism is an idea, and American "White" racism is an idea, but racism is a category of ideas that contain a given meme of biologically-centered in-grouping.
It is hard to say that that entire category contains only toxic things. 'Homosexual racism' has historically served to concentrate the gay population into areas where our scant numbers don't make it impossible for us to find one another. But in all other ways is is basically the same as more conventional categories of racism -- it chooses a biological marker and draws the people who display it together in common defense against everyone who does not display it.
You can endlessly debate whether 'Black racism' is officially racism, but to the degree it fits the same pattern, it does some good. It establishes environments where it is better to be Black than White, and gives Black people a respite from all the other forms of racism working against them, even if it excludes others and limits some participants' tolerance for differences. (Without it Americans would have to listen to Country music...)
To generalize that all 'in-grouping ideologies' are toxic because they share a single meme that has often caused a great deal of damage, doesn't work. The whole idea, capable of being acted upon, is productive or counterproductive in a given environment.
Appadurai, for instance, makes the distinction between 'predatory identities' and other identifications, but it has to do with their intentions, their basis, and their effects, not their content. Identities become predatory when it is clearly in their best interests to eliminate those who come between them and 'true ethnos', the meme behind our overall notion of a State with a national character. Many states do not contain such groups, they can have the same kind of identity, but if they have no one to render invisible, it can provide productive leverage on cultural traditions.
So even as a compete idea, it is not reasonable to call the idea itself toxic, unless it serves a different toxic agenda. Germanness, as an idea, can be a good thing, or a bad thing, depending upon the context. When Germany was a collection of warring principalities, it was a good thing. Acting on it ended wars and saved lives. Later, when Germany was a neurotic mess that hated its inability to finish the project of unification and blamed those distant from the center of its projected 'ethnos' it was toxic in a very literal sense: it killed people -- instead of ending wars, it started them.