[dude with glasses in a communist t-shirt, arguing] I'm the only leftist here, your opinions are TRASH
[dude holding a theory book on smug, arguing] Read theory you losers, you're all WRONG
[dude in an anarchist hoodie, arguing] Nuh-uh, I'm the only leftist here, you're SHITLIBS
[the three dudes are now caught in a cartoon fight, glasses gone flying, punches everywhere, while a firing squad of nazis are targeting them with rifles]
[a confused nazi asks] Why… why are they still arguing?
Those people were not being ironic, no. I think it's just a phenomenon that is excessively more common amongst internet MLs. Real life MLs are okay for the most part. Internet MLs are pretty much a cult that will try to take over ANY leftist community or be the dominant form of leftist discourse through any means necessary and will excessively push propaganda from literal fascists because they happen to be against liberals.
All I'm saying is that an embarrassing amount of leftists are terminally online and unable to do anything to try to push leftism other than argue with liberals online and spout hate towards those they see as "betraying" leftism. Those people don't actually do any organization IRL, which to me is a blessing... but sometimes that doesn't work. Brazil, and by extension all of South America, has a very bad problem with MLs dominating online AND IRL discourse, making it hard for other forms of leftism to be considered or even debated in good faith.
"those people" aren't real, you just made them up so you can punch left