No joke. Check out the research article referenced in Psychology Today.
For a few years now I've been saying that racism is a psychiatric disorder, and let me not be politically correct and instead be honest in also saying that the baseline common denominator of "political conservatism" is racism.
We're never going to solve problems in 3D if we don't at least start by calling things what they are.
So, say it: "Racism is a psychiatric disorder."