I come across it the most in primmie spaces. Not Zerzan, ofcs, since the man thinks the ego is a form of oppression (what a fucking weirdo), but from folks like Landstreicher and Perlman. Perlman took the liberal idea that in primeval times we were all individuals without kin and went "this is good , actually." Landstriecher just kind of... ran with Stirner to the exclusion of almost everything else. The only anti-civ egoist I've seen with a response to it is Alejandro De Acosta who argued that you can read the Unique as referring to a collectivity and The Unique and Its Property still makes sense.

But like, it doesn't seem limited to the anti-civ individualists. I often see Crimethinc. putting out individualist article claiming that democracy is suppression of the individual or that freedom is individual freedom from constraint which seems at odds with recent thinking about partial and partable selves, multitudes as selves, and the fact of interdependence down to the sub molecular level.

yeah tbh i havent heard a lot of anarchists talk about stout individualism like this person, i lean more into ansyn - ancom territory and not heard that a lot, but from that perspective i figured that was a good attempt at the question