Oh, here we go:

Milk is the new, creamy symbol of white racial purity in Donald Trump’s America

“…Some white supremacists think white ethnic identity has a geographic, historical correlation with the body’s tolerance for milk — specifically, the production of the lactase enzyme that allows humans to break down lactose.

On 4chan, the internet’s hate speech hit factory, one anonymous poster laid this thesis out using the following graphic from a study in Nature, showing hotspots of where certain populations have higher milk tolerances.
https://mic.com/articles/168188/milk-nazis-white-supremacists-creamy-pseudo-science-trump-shia-labeouf#.JqOuHADmU