You are confusing speech on twitter with real life actions that include speech.
Going to my neighbors and lie about me is a real life action with speech. On top of that you force them to listen to you (at least temporally) AND it is targeted specifically at my neighbors which means you have an intent beyond informing people from the general public who happened to voluntary listens to you.
If it would actually be true then you could make the claim that your intent is to protect my neighbors kids (but you should ofc instead report it to the police) but if it is a baseless false accusation or lie then your INTENT was to harm me and that is not comparable in any way with a "slur", "insult" or "mean speech" its an actual criminal act.
>When your rhetoric also often includes violence, they are incitements. "There's a pedophile living in your neighborhood, snatching up children left and right, right under your nose! We must act as We The People to defend our way of life against these groomers!"
Nothing is this example is even remotely criminal, there is no way to find intent to harm someone in that. It could be boiled down to "lets protect our kids from criminals" A (generic) call to action but not to violence.
Its ofc silly to post something like that on twitter but it wouldn't even violate twitter rules. The word "groomer" on twitter is only "banned" if directed against a twitter user or other specific non-anonymous real person.
What actually happens on twitter is people are filmed acting and saying weird, creepy or sexual things around/to kids (Even the POTUS did that) and then people call them "groomers", "pedos" and other insults. I dont see the point of doing that but its definitely not criminal and not an incitement of violence its an insult and expression of disgust.