Since 2015, after decades of smearing the Mainstream Media, the MAGA Nazis have been coming on the very shows they have been disparaging, and spewing their propaganda alternative facts to regular Americans who haven't discovered, or avoid the Conservative Propaganda Machine. They realized the power of getting on the enemy's platform, and poisoning the water.
That's why AOC, and anyone else who wants to fight back, goes on Twitter. To force the enemy to see the other side, whether they like it or not. If they are totally immersed in the Conservative Propaganda Machine, then this might be the only way they'll ever hear an alternative view.