[@Dynamo Frokane] You don't have to invent a new word from scratch for it to carry new meanings and connotations through your propaganda, you know. It existed in 2010 but it wasn't prevalent until Hillary's speeches in 2016. They found a fringe word and assigned it to anyone they wanted to demonize as a bunch of filthy racist-sexist-Islamohomotransphobes trying to hinder that sweet, sweet progress of getting a person with a vagina into the Oval Office.

It's the Red Scare: 2017 Edition. Anyone who likes U, V, or W, but doesn't like X, Y, or Z, is a [s]communist sympathizer[/s] alt-righter.

At this point "alt right" has become the [url=https://en.wikipedia.org/wiki/Yankee_Doodle#Early_versions]"Yankee Doodle"[/url] of the current year because a small number of people have chosen to wear the label proudly, believing that doing so will disarm it of its negative connotations. But at its heart it is a term which the left appropriated to lump them all together into a single, easily-attacked entity.