They have no culture of their own

I think it has nothing to do with the reasons they give, they just want to push western narratives of "righteousness"

I've been to political rooms in blahaj before and the discussed politics always boil down to anti-conservatism and anti-russian/chinese imperialism,

US imperialism? You'll be called a tankie and told to stop acting like one to fit in

Israel genocide? You're regressing the progressiveness of empowering jews, stop being overly antisemitic and using tankie sources

Some political news africa? Turn it about weather or not they support LGBTQ rights yet

Riots in south america? Their governments are oppressing them, also stop using tankie sources

There's no way they can be this biased by coincidence, i'm not a tankie and i didn't believe it at first but it's true, Tankie do carry the burden of always being right!

It's spurned by liberal admins and mods usually. They can't actually argue against us so they put their cognitive dissonance into an unhealthy place of self-soothing.

This actually isn't unique to Lemmy at all it is the default reaction of committed liberals and liberals with thin skin. But when someone feels ownership of a place and like they're losing legitimacy and control they can lash out.

It's also important to understand that most people online discussing politics in these forums know basically nothing. They don't read. They can't critically engage with media. They don't question their own biases when presented with people from other cultures. They certainly don't actually do anything irl that would teach them visceral lessons. Trying to build an organization (not a career in a non-profit), a party, or even just feeding people. They might as well be 10 year olds for all the information contained in their political opinions. But they feel extremely entitled to their positions and wrap it up in their identities. If they are contradicted they feel personally attacked. If they think something despite having never investigated it, they announce it proudly with confidence and bully those who disagree. In short, humility runs counter to their socialization.

Finally, they're used to punching right, or at least most of them are, and their rhetoric breaks down when they are instead forced to punch left. So they just start namecalling instead, banning, or just trolling, as it allows their egos to escape without much damage.

Luckily, we are looking at an echo chamber of people who automatically self-isolate and can't organize anything. In the real world conversations are faster and more productive and building things and teaching is much easier, even with an audience that isn't entirely friendly. Irl people usually can't get away with acting like such babies.