It's just another term liberals are using to describe people who disagree with them....
The term was not invented or promulgated by leftists. It was created by and for the alt-righters themselves. The name was coined in 2010 by a pair of white nationalists who started a website AlternativeRight.com (now defunct).
The alt-right is
very different than traditional social or economic conservatism. They aren't interested in promoting traditional values, or elevating market forces to divine status. Rather, their goal is to fire off racist and sexist comments specifically to outrage other people. They tend to be younger, and involved in social media.
For example, it was the alt-right that savagely attacked Leslie Jones via Twitter a few weeks ago, gleefully inundating her account with racist and sexist insults, images of Harambe the gorilla (now their racist mascot, apparently), and making up fake Twitter accounts to attribute racist comments to Jones. This is not something that a conservative evangelical or a fiscal conservative would do.
The whole point of Progressivism is to split everyone up into certain demographics, demonize them, set them against each other and ultimately destroy society so that Progressives can come in and "fix" it all. It's classic Trotskyism.
Please.
Progressives did not demarcate the lines between various flavors of conservatism (traditional, paleo, neo, fiscal, social, alt etc). Y'all came up with that yourselves.
Progressives did not invent the idea of demographics; if anything, it was the racists, slave-owners, segregationists, xenophobes and nativists who have wounded the consciousness of this nation with the separations that wound up developing into identity politics.
More to the point, the whole tribalist game of "in-group" and "out-group" is almost certainly an evolved trait. While the criteria can change at the drop of a hat, the desire to know who is Us and who is Them is deeply ingrained in human psychology.
The very act of trying to shove all "progressives" into a single uniform out-group is an example of an attempt to exploit this very tribalism, to split up society into different groups, demonize the Other, set everyone against that Other, and destroy the Other.
I.e. next time, you
might want to look in a mirror, when you are, well, demonizing a group by claiming they demonize people....