I’ll take a stab: because twitter isn’t reality, it’s a microcosm. A tempest in a teapot. It’s something that if you step outside of, you realize it’s not the real world.
Leaving social media can be thought of as emerging from the cave: you interact with people near you who actually have a shared experience to yours (if only geographically) and you get a feel for what real world conversation is like: full of nuance and tailored to the individual you’re talking to. Not blasted out to everyone to pick apart simultaneously. You start to realize it was just a website and the people on it are just like the shadows on the wall: they certainly look real and can be mesmerizing, but they have no effect on anything outside of the cave.
Reddit even more so, thats why you see these 'touch grass' comments littered around.