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.