Diana Mutz of the Annenberg School for Communication and the School of Arts and Sciences spoke about the ways food is used to make distinctions between groups of people. “It’s a way to draw lines between themselves and others—which is a shame, really,” she said. “But these kinds of things do the trick when they are trying to differentiate and divide.”
https://www.washingtonpost.com/news/voraciously/wp/2019/11/15/move-over-latte-liberal-a-new-gop-insult-invokes-goat-milk-and-avocado-toast/ The Washington Post