Dealing with a biased moderator could be a really tough thing to do. Moderators are supposed to be fair when it comes to dealing with members. However, if moderators are themselves so biased, this could make things really complicated. Spotting a biased moderator could be tough as well. So, how do you deal with a biased moderator?

Remove them. I’ve found it’s easy to rip the bandaid off sooner rather than later. The largest site I’ve ever owned almost shut down about 10k members in because I hired a Celebrity (For the genre) as a moderator. She was super cool, friendly, helpful, etc. but the moment she became a moderator she had bias for her friends, and followers. So she would let them slide with a lot of things, etc. I let it slide because, well, she was a celeb and brought a few thousand people there herself. Wellllllll at about 15k members she did something drastic (I forgot) and I ended up stripping her of moderator, but by then she had a web in the community and it ended up splitting the community and killed the site drastically for a few months. We ended up bouncing back, but it was never really the same, or as active.

So, from my personal experience I’d say strip them of Moderator, send a polite DM explaining why, and move on from there. Or if you’d like to do the 3 strike rule you can do that but personally, I’d just strip them. It’s better to lose a mod and potential active member now than a mod/potential active member, and anyone who’s grown attached to them during their staff position.