Hexbear is anti-sectarian, meaning Marxists and Anarchists are allowed, just not liberalism. As for toxicity, I find Hexbear to be one of the least toxic, especially when compared to Lemmy.world.
Gonna have to disagree with you there pretty heavily. Maybe there’s a different experience as an Anarchist vs a Marxist but, while I like conversing with a good number of Hexbears, I’ve found that the the instance is incredibly toxic with the cultivated “dunking” culture rewarding participating in insular, anti-social behavior for Internet clout and mods participating in sectarianism by disingenuously labeling non-ML leftist voices and critical historical analysis as fash.