But most of all there is sex. The alt-right has a lot of young men in it, young men whose ideology can be assumed to confront them with obstacles to meeting people and dating. Sex-cynicism and race-pessimism, of course, often travel in tandem. At the National Policy Institute conference, the writer F. Roger Devlin gave a talk on why young Norwegian women in Groruddalen, outside Oslo, preferred dating Somali and Pakistani gang members to ethnic Norwegian boys-next-door. “The female instinct is to mate with socially dominant men,” he explained, “and it does not matter how such dominance is achieved.”

Likewise, the common alt-right slur “cuckservative,” a portmanteau combining cuckold and conservative, is not just a colorful way of saying that establishment conservatives have been unmanly. According to Matthew Tait, a young ex-member of the far-right British National Party, the metaphor has a precise ornithological meaning. Like the reed-warbler hatching eggs that a cuckoo (from which the word “cuckold” comes) has dropped into its nest, cuckservatives are raising the offspring of their foes. One can apply the metaphor equally to progressive ideas or to the children of the foreign-born. Type “reed warbler” into YouTube, and you will find a video with more than a million views, along with a considerable thread of alt-right commentary.

The internet liberates us to be our worst selves. Where other movements have orators and activists, the alt-right also has ruthless trolls and “doxers.” The trolls bombard Twitter and email accounts with slur-filled letters and Photoshopped art. Doxing is the releasing of personal information onto the internet. Last month, several alt-right writers, including Mr. Spencer, had their accounts suspended by Twitter. Mr. Spencer says he appreciates the “frenetic energy” of trolling but doesn’t do it himself.

The alt-right did not invent these tactics. But during this election the trolling reached a sadistic pitch. Journalists who opposed Mr. Trump received photos of themselves — and in some cases their children — dead, or in gas chambers. Jewish and Jewish-surnamed journalists were particular targets, especially those seen to be thwarting Mr. Trump’s rise: Jonah Goldberg, Julia Ioffe and Ben Shapiro, among others. The Daily Stormer has been particularly aggressive in deploying its “troll army” against those with whom it disagrees. A signature punctuation of the alt-right is to mark Jewish names with “echoes,” or triple parentheses, like (((this))).

One got a strange sensation at the National Policy Institute gathering that everyone in the room was either over 60 or under 40. There was a lot of tomorrow-belongs-to-me optimism, as if the attendees felt the ideas being aired there were on the verge of going mainstream. Whether this had anything to do with Mr. Trump’s victory or the effect of alt-right rebranding was hard for a newcomer to say. As Mr. Spencer spoke, a dapper guy named Ryan looked on. Ryan was a 27-year-old who sported the common “fashy” haircut — close-cropped (like a skinhead) on the sides, free-flowing (like a mullet) on the top. Mr. Spencer was lecturing journalists about how it took courage to embrace a movement that was “quite frankly, heretical.”

“For the moment,” Ryan muttered.

Mr. Tait, who hopes to start an alt-right movement in England, said: “What you’re seeing now is young people who have never been affiliated to any kind of politics, ever. They don’t remember what it was like before the war or in the 1960s or even in the 1980s. Their motivation isn’t a sense of loss.” That is what is “alt” about the alt-right. These people are not nostalgic. They may not even be conservatives. For them, multiculturalism is not an affront to traditional notions of society, as it would have been in the Reagan era. It is society.

The Vanderbilt University political scientist Carol Swain was among the first to describe the contours of this worldview. In her 2002 book, “The New White Nationalism in America,” she noted that young people were quick to identify double standards, and that they sometimes did so in the name of legitimate policy concerns. “I knew that identity would come next,” she recalled. “It had to come. All they had to do was copy what they were hearing. The multiculturalist arguments you hear on every campus — those work for whites, too.” Mr. Spencer, asked in an interview how he would respond to the accusation that his group was practicing identity politics in the manner of blacks and Hispanics, replied: “I’d say: ‘Yuh. You’re right.’ ”

Professor Swain’s analysis does not just pertain to radicals. It is a plausible account of what is happening in the American electoral mainstream. The alt-right is small. It may remain so. And yet, while small, it is part of something this election showed to be much bigger: the emergence of white people, who evidently feel their identity is under attack, as a “minority”-style political bloc.