First of all, if you freak out and pay attention to them, they will keep coming back and acting out in more egregious ways to get attention. That is what they do. By calling the cops, demanding that the city council make some sort of statement, or getting all riled up on social media, you're playing into their hands. A reaction is what they want. Ignore them and they will go away.
As far as calling the cops; Ventura County deputies will respond to anything. So there's that.
Third, how do we know that this group is a bunch of real white supremacists and not some sort of leftist funded false flag, or worse, from the government.
Finally, what bothers me is that the city council and elected officials are getting in the act of condemning these people. Nothing wrong with that but it is incongruous. The idea behind free speech is you can say all kinds of ugly and unpopular things without the government stopping you. Official resolutions passing judgement on political beliefs or movements, good or bad, are wrong. Politicians are dancing monkeys who will do what the public want them to do, even if that means they must use the power of government to virtue signal.
I also find it disgusting that the public can be lead around by the nose so easily. Damn a non-violent, non-obstructionist protest because you're told these people are bad, yet ignore or even praise the violent, destructive BLM rioters? The hypocrisy is galling to me. I will conclude with saying that the sheriff's department social media posts were pretty even handed. Although they shouldn't be using the term "hate speech." Under the constitution, there is no such thing.
But please, I implore you, ignore these people. Don't give them fuel to keep coming back.
Note: this an adaptation from my non-fiction book Suburban Warfare: A cop's guide to surviving a civil war, SHTF, or modern urban combat, available on Amazon.