Comment by heavyset_go

Earlier than that, this brand of social/economic/racial/sexual/etc aggrievement and reactionary politics was bred via 80s-90s AM talk radio.

The talking points that were ascendent in the Tea Party era to 2016, and are still ascendent today, were honed at that time in that sphere. Limbaugh said words 30-40 years ago that breathed life into a reactionary movement 20 years later and shaped its theory.

You can keep following the thread back, but I think this form of weaponized aggrievement took its shape at that time, its literal memes were potent and virulent back then, they just needed the right environment to really spread.