I understand.I heard no threat of violence. I could have missed it, but I do not remember any threats are call to violence. On the other hand, abusive language is against the law here, even if it does not call people to violence, like their cussing and sexual remarks, as well as the prolific use of the “N” word.
Where I am from, police are only involved if the public safety is at risk -IE there is violence being called for.
So when I understand one to want the police called for what they were shouting, I hear an acknowledgement that there is a call to violence.
Perhaps the laws are different in your area.