Forum rules has nothing to do with how they administer their server(s). The 2 are unrelated. If the server owner wants, they can be for using whatever slurs they want.(as many servers do, mainly event servers) or teamkilling, or whatever. FSE doesn't have a say in how they make their rules or how they enforce them in game. Same goes for what names people use. The only servers FSE has control over are the few official servers.(NA1, EU1, their TS, and the test server)
If there is something that is against the forum rules, then report it so it can be looked at.
anyways, if they have a preferred place for stuff like this, like their steam group, then use that to talk about the rules or whatever comes to mind.