It is impossible. Most people don't see a problem with this. Especially the trolls who have more power than they should.
The only time things have even marginally changed in the US there's been violence. Civil rights, suffrage, the labor movement, ending slavery: All of them required thugs cracking skulls before they could happen.
So unless we have about 10% of the population willing to put themselves in harm's way we're stuck like this.