[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?

https://thebad.website/comic/infighting
See the comments for a bunch of examples
Still looking for a single leftist here who claims they support communism. I constantly see it being attributed to the left, but in real life scenarios I just don't see it, only in memes, unless you meant socialism, which is a healthy system of every country, including US.