In an anarchist ideal society everyone would get along and it would be butterflies and gumdrops. But in reality the person with the bigger stick will simply take what they want and everyone will just say “hey stop that” and then get shot in the face. Naivety: political edition.
Who do you think keeps getting into street fights with fascists? Like anarchists are notoriously willing to engage in political violence against oppressors. For fucks sake we had an army in the Russian revolution and we poured in from around the world to shoot at Francoists.
Which anarchist said everyone had to get along? You’re building a straw man nobody is actually advocating for.
If you need an example of how a system of agreement across large groups that sometimes violently disagree can work without any governing body see bitcoin and the block chain ledger it maintains. You don’t need 100% agreement to maintain the integrity of the ledger, just 51%.