White people who openly say that “Diversity is a code word for white genocide” are explicitly stating white people are too weak to survive if they have to compete equally for resources and would literally die out- literally go extinct- without being protected and isolated for their safety.
Y’all white people need to do something about those weak links among you.
It might seem like this argument would work but it doesn’t 😦 I mean, it works against people who are on the fence, but committed white supremacists already have a practiced answer: the white race is always the best and smartest and strongest and whenever they’re not, it’s because traitors on the inside (Jewish people) stabbed them in the back. It’s the same argument Hitler used to rise to power: https://en.wikipedia.org/wiki/Stab-in-the-back_myth
This is an incredibly powerful explanatory model if you choose to believe in it. Everything good you do is because you’re naturally good and deserve it: everything bad you do is because an enemy made you do it.
It also doesn’t work for the same reason why “so you think you’re the master race but Asians and Jews are inherently smarter?” doesn’t work. They don’t so much see themselves as the best at everything ever as much as the creators of everything wonderful that has existed. They see all the pretty cathedrals in Europe and go “this is the pinnacle of human achievement and we will never get back to anything like it.” They think any intermixing between White and non-White cultures will lead to the end of civilization as we know it. They justify all of this with some really bad evolutionary psychology. It’s all rubbish of course but it’s attractive to people who are willfully ignorant of science and history.