I am certainly not an admin. But, I sure have seen all the screenshots above. Let me ask you something, what's the point of visiting or paying attention to that person if he's bringing people down, and feeding the wrong and harmful information to your mind?
Admins sure can ban him. But such things often happen over a website like this. If today Aizen, tomorrow someone else.
Let's pause for a moment, and find a solution. Solution is pretty easy, tell yourself and your friends to avoid such person. If you see his room with inappropriate title, ignore it as well, and join wholesome company. If he joins you, either ban him or ignore him again if you're not host.
Once a wise man said, “Keep thy heart with all diligence; for out of it are the issues of life.”
He meant, Guard your heart with all effort from negativity, toxicity, and so on. If you don't do that, you'll have depressed thoughts. These are the issues of life.
You yourself need to take action first, and problem will be solved. However, I still encourage admins to ban such users like Aizen since they are breaking a rule which said, "No trolling".
Have a good day.
Keep yourself and your friends safe.