> There are plenty of new ones all the time; egirls, fuckboys, vsco girls, streamers, influencers, incels, you can also be "basic", "based", etc... it's possible you're not seeing it as much because you're getting older and these are adolescent tribes

Most of those are not new... "egirls", fuckbois, etc. were all around back then as well. These groups are somewhat non-related, since many of the listed groups are not mutually exclusive. You can have a fuckboi influencer, vsco egirls, etc.