Like with the ‘teabagging’ these people go directly to an arcane, thoroughly disgusting interpretation of a word that most of the people who have used it are probably unaware of. Says more about them than the word, or the people that have used it.
It’s not “them,” the left, it’s the dissident/alternative right. And it’s an entirely accurate and devastatingly effective term to describe the politically correct, anti-racist conservatives who think a brown America will ever behave like the once-90% white America did, according to European principles.