I’d attribute this to two main factors:

1. The wealth inequality we’re dealing with has a higher ceiling (and higher floor) than the wealth inequality in pre-revolution France. We’re poor and hurting financially, but most of us are still able survive day-to-day without viscerally feeling the effects of our poverty.

2. The internet keeps us apart. Pre-internet, people built communities, coalitions, and armies much more effectively because they weren’t so isolated in their homes, and so paralyzed by screens.

EDIT: the advent of suburbanism & carcentric infrastructure is another factor that keeps us more isolated than past populations have been. People used to live right alongside each other and their communities used to be walkable. The most disadvantaged among us (and therefore the most personally motivated to mobilize) are also the most limited by carcentric infrastructure.