Become the owner of a website.
Then you, too, can establish some rules about who is, and who is not, welcome to post on your website.
Until and unless you want to take some of your own time, talent, and resources to establish your own website, you really need to understand that you are never entitled to post on someone else's website -- you are a guest. And guests who offend become guests shown to the door.
Wow, how reasonable is this? Yes, this website is private. It's like a club. Those who run it get to decide who stays, and in the case of trolls, who goes. What could be simpler?