I don't think there was any real reverse colonisation. 4chan's userbase was always whimsically racist and A Wyatt Mann cartoons were everywhere long before the conflict. moot and WT Snacks implemented some interesting word filters that I can't repeat here without my post getting hidden. Everyone was hateful, but not full of hate.
I think very little has changed in twenty years really. Feral male behaviour is just arbitrarily right-coded now, when it wasn't during the Bush era. Most of the kids screaming bix nood probably voted Obama in 08. Politics is window dressing on timeless brand of petulant contrarianism.
If you're a parent, teacher, or intelligence officer worried about a "crisis of radicalisation", the worst thing you can do is take this stuff seriously. Just call your son gay until he grows out of it.