"Bothsidesism" is a lie that is used to avoid criticizing one side when the other side is also bad. Just because one side is awful does not grant the other side a free pass to be immune from criticism or to get their way on everything. The idea of "bothsidesism" forces a false dichotomy and then forces you to pick a side, when there are almost always more than two choices. It's what partisans use to beat down people who say "I pick 'None Of The Above,' because you both suck."