To use your excerpt as an example, I wouldn't consider Tanton's observation about corruption with regard to Latinos as racist overall. If we look at Mexico, for example, cartels wield a lot of influence there, and we know they are an issue in parts of the US currently. This doesn't mean that all Latinos are connected to cartels or even that the average Latino is, but the more open an immigration policy is with regard to Mexicans, the more risk there is for letting cartel members enter and establish themselves. Even his observation about birth rates is correct, albeit I can agree that the tone of his observation regarding this was racist.
As for the white nationalist characterization, maybe a clearer way to express what I meant is that I don't view this label in the same light that the SPLC and many others do. Black nationalism is fairly common in this country, yet few people who subscribe to it are called out for it. Nick Cannon didn't get called for it until he started making remarks about Jews, for example. He had said a lot of negative things about whites before that without issue. The way I see it, I don't fault any individual for preferring their own group over others, since that's a natural tendency for all cultures. White liberals are one of the only groups with an outgroup bias, for example. Pretty much all other groups have a significant ingroup bias. So, I don't find white nationalism any more objectionable than I do black nationalism. I don't personally subscribe to either one, since I prefer a more culturally based form of nationalism. I suppose you could say I prefer Christian nationalism, although I mean that in terms of values, not an actual theocracy.