And writing about killing members of any group only services to rile up and incite those people among us who are predisposed to violence. And those people are of every color and nationality that exists.
The point I was trying to make was that the tragedy you're referencing targeted people because they were Jewish. Saying, "oh, but white people have to be fearful, too" dismisses the hate that drove this despicable act of terror, and it hides the purpose of it. Terrorist actions are meant to scare specific people, and white folks (by the terrorist's definition, which doesn't include Jews) aren't who this terrorist wanted to scare. He wanted to remind Jewish people of what he views as their proper place...running scared. He also had a history of white supremacist posts throughout his twitter and gab history. This was a racially motivated crime, don't downplay that by saying white people could be a target, too.
While we (white folks) could be the target of hate crimes, in the US today, we are not. Jewish folks, black and brown folks of all sorts, LGBTQ folks, are the target of hate crimes, and in growing numbers.
If there was a site that was filled with people saying "kill all whites", and the site was fine with this, and then one of its members went and murdered a load of white people, then yes I'd say they would probably be booted by their host too. They don't get points for booting the actual murderer after he'd done the murders.
Surely, you can see that a sustained effort to recruit for racist violence, and an ongoing celebration of racist violence, by people who have a history of racist violence, is not comparable to a joke about killing white people by someone who is not organizing to commit violence against white people or celebrating the death of or violence against innocent white people. The fact that you know enough about the situation to make that comparison, but still ask that question...means that I can't trust the sincerity of your question.
I'm sure there are people who incite violence against white people, and people who would like to commit violence against white people. But, they don't have a voice in our society, whereas violent white supremacists do, and on a level they haven't in my lifetime. Just in the past week there have been three white supremacist terrorist attacks: 11 Jews dead in a shooting, 2 black folks killed in a shooting, and the unsuccessful bombing attacks. That didn't happen because those folks are white, it happened because they were perceived as being a threat to a particular way of life that has white folks on top.