If there wasn't massive inequality and poverty to be tapped, bored energy wouldn't be so easily redirected to the culture war.
It's all middle and upper-middle class Americans who have the luxury and time to spend time on social media (often at work).
So, no, it's not just middle- and upper-middle class Americans on social media.
Your opponent nowadays is a very pragmatic autocratic regime, with it's own issues, but this corona-crisis at least showed they can keep their mandate of heaven. Four more years in this culture war and you won't be able to get consensus on anything.