I was banned from r/history a few months ago. The moderator was attempting to humiliate me and added flair to my comments. I turned flair off. Then the moderator abused the stylesheets to hardcode flair that I couldn't turn off...

That's against reddit's own rules, and the admins claim they will ban moderators from reddit sitewide for that.

I went to the admins, they made him turn it off... and 1 minute later I was banned.

The admins never banned him.

Mod abuse occurs all the time. There's just nothing to be done about it, and there's no point in whining so you never much hear of it.