Earlier quoted context omitted.
I don't see what's massively objectionable about wanting to build a community based on tolerance, kindness and mutual respect.
It's an existential threat for people who want to be intolerant, unkind, and disrespectful, because it makes it clear that spaces that don't accept such behavior end up being at least as productive and as useful for the world as spaces that do. Therefore it's extremely important for such people to establish the world as a a safe space against safe spaces, and to push the idea that such spaces are untenable or morally…
I like that they made the attempt to build this but I would have never joined it because I could see myself getting into conflicts because of my beliefs.