This answers my question, thanks.

It doesn't actually. You need to define what getting stream of dozens of people celebrating a genocide means because the appropriate action will depend on it.

Is it an organised campaign? Is it you being targeted because of who you are? Is it happening on 4chan? Is it happening in a whatsapp group? What are the nature of the content? Do they claim stuff about you? Do they threaten you? Are they writing alternative history?

Simply deleting doesn't help with anything. Remember PewDiePie who was cancelled for making antisemitic jokes? He probably didn't know what he was doing because of his perspective there are no more nazis around and all that stuff is history from 50 years ago so it's just a joke. Deleting content gives the impression that these don't exist or that it's not a real danger.

That's a poor take. PewDiePie ABSOLUTELY knew what he was doing. He simply banked on it being edgy enough to only piss off some people. He knows his numbers and analytics, he knows straddling the line between what is acceptable or not gets the most outrage, clickbait, and views.

Meanwhile a history teacher and film maker on youtube dresses up as a literal nazi in several videos, including swastika, and does not get cancelled because it's pretty good satire.

Freedom of speech means you get to tell any joke you want, but freedom of speech does not mean people have to treat your actions as a joke just because you meant it as a joke. You don't get to be the sole arbiter of the "goodness" of your actions, because not meaning to hurt people doesn't let you off the hook for hurting people.