In other words, community builds up in-group identity. Joining a soccer club can build white community and white supremacy.
Most white men who become radicalized into the alt-right start out in search of some like-minded friends.
Though various branches of the movement are often at odds with one another, they share a number of core beliefs — and a common meme-flavored vernacular — that serve to unite them in what is sometimes called “the manosphere.” This realm includes the “men’s rights” movement, pickup artist culture (a community of men also labeled “PUAs” that essentially makes a game of the art of bedding women), “incels” (men who are “involuntarily celibate” because they feel women reject them), and geek gatekeepers like supporters of the Gamergate movement.
On the surface, PUA communities and incel communities have a lot of generic appeal: The PUA lifestyle emphasizes self-esteem and confidence building along with physical health, while the incel community allows men to bond over their struggle to achieve all of the above in spite of their sour luck with women. Meanwhile, gamers and geeks habitually tout the importance of gaming in providing social interaction for young men.
These spaces foster the kind of male friendship whose importance doesn’t get a lot of attention in the real world. But the benefits of their existence are often accompanied (and sometimes negated) by their tendency to instill in their members a newfound articulation of fundamental anxiety over their position as men in a society where women are actively seeking empowerment.
And in building its membership from so many different communities of white men who ultimately feel threatened and rejected by women, the movement promotes a sense of male entitlement that is easily radicalized into white nationalism and white supremacy.