That is, unfortunately, unworkable. You cannot successful quarantine toxic people from non-toxic people in the same community. People who aren't toxic rarely want to spend their time around toxic people, and those that don't mind it are usually those who aren't the targets of the toxic people. A community with many members who are openly white supremacists might not be uncomfortable for other white people -- even if they themselves are not white supremacists -- but it's almost certainly unusable for those that are the target of the white supremacists ire. Look at any "open communication platform" that doesn't make any effort to ban "toxic" behaviour and you'll find that the toxic behaviour leaks into every aspect of the platform.
If a website permits members to be openly anti-semitic or racist or sexist then they will be anti-semitic, racist and sexist everywhere, whether that's a quarantined sub-community about anti-semitism, or a community about video games, make-up or curating art for galleries. No amount of education is going to encourage jewish people to spend their time talking to openly anti-semitic people about video games. If you permit toxic behaviour then you exclude anybody who feels threatened by that behaviour.
If a website permits members to be openly anti-semitic or racist or sexist then they will be anti-semitic, racist and sexist everywhere, whether that's a quarantined sub-community about anti-semitism, or a community about video games, make-up or curating art for galleries. No amount of education is going to encourage jewish people to spend their time talking to openly anti-semitic people about video games. If you permit toxic behaviour then you exclude anybody who feels threatened by that behaviour.