Not in the sense that they’ll all be confiscated, but in the sense that multiple anarcho-communists have told me that under their utopia, theft will not be a crime.

source: dude just trust me

They were probably saying there will be no reason to steal because resources will be plentiful, not that you can just take other peoples stuff and it's fine.

They’ve also told me that under anarcho-communism, there will be no state, thus no laws, thus no justice system.

no they didn't, a state is just a monopoly on violence in a given region, there will still be law and order through democracy and consensus, it'll just be horizontally handled by the community.

If you are wronged, your only recourse is vigilantism – a point I can’t help but notice you quoted but conveniently glossed over

this is just nonsense, we just believe these things would be handled communally, not by authority, but by democracy. it got glossed over because it's just as much nonsense as the toothbrush thing.

But I digress. Vigilantism doesn’t work (I’d be happy to explain why if you have trouble with that as well) and I’m still waiting to hear a single anarcho-communist propose an alternative.

democratically run courts with rotations, honestly there are hundreds of ideas, google it. Nobodies idea is what you're saying, it's just a strawman.

Does leftism only count if I do it in public?

No but it means if you do it wrong you'll get made fun of. You've clearly never even read a single book on anarchism and have strong opinions about it.

If your opinions are based on complete nonsense strawmen, that explains why you keep getting made fun of.

The point of the comic is that absolute buffoons say they're getting bullied and that's the reason they're getting pushed right, like you. It has no basis in reality, people are just criticizing things they should criticize, and since you don't bother to do the necessary reading to understand why people are criticizing you, you just go "the left is mean wahhh"

The fact that your arguments are covered in socialism101 courses shows that you've never even bothered to make an attempt. Do you actually think socialists are so dumb that they never thought of these arguments? Do you actually think marx or kropotkin never came up with "but what if someone murders someone" on their own?