[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?
The opposite is the case. What worked historically is organizing in an ideologically united platform.
Vanguard parties won revolutions. Ideologically diverse big tent organizations have always eventually broken apart and none has brought a revolution thus far.
And working with liberals has never been a good idea. They're not a part of the left, they belong to a right wing ideology. That would be like saying we should work together with Nazis, because after all they have socialist in their name.