I wouldn't say it's fully bullshit. The far left and far right, despite having very different ultimate goals, do have one very significant common point in both being opposed to the status quo, and in that opposition, you see some common tactics and ideas develop, such as a tendency towards authoritarianism and an increased tolerance for violence.

Consider that weirdest kind of leftist who's so far down the "America bad" rabbit hole that they unironically support Russia's invasion of Ukraine, despite Russia being as close to a Christo-fascist sexist homophobic authoritarian hell hole as currently exists.