There is a user on a wiki that I edit on that I debate with a lot about in-game topics. These arguments used to be civilised, with each of us giving our points. However, recently this user has been swearing at me and making personal insults unrelated to the topic we are discussing. I have contacted a local bureaucrat but they won't do anything, saying that they don't want to ruin their friendship with the abusive user. Other admins who try to fix the problem will likely be demoted and probably blocked by the bureaucrat if they try to intervene (the bureaucrat is known for blocking users who disgaree with him/her).
What do I do about this situation? Thanks in advance.