Feature Request: Block Server

I have unfortunately had to block a few users (and reported to law enforcement) and have wondered how to block certain servers where I know they spend their time. I know that unless I join a server there is no direct contact and no way for my activity to be observed by these individuals (unless they use alt accounts and stalk me), but I would still like to make sure that I can steer clear of the places they frequent.

It might also help with strange servers like these: https://www.youtube.com/watch?v=nfudlY_RV9g