Fortunately, it's up to the site owner to create the "list." So long as it's up to one individual, it's not so hard. If you try to do it "by committee" it will be much harder.

Given that idiot will be forbidden, will imbecile be found to be just as offensive? How about moron? There are others, of course, but which will be "offensive enough" to be on the "list"? As long as it's up to one rather than several, it works, because it's one person's judgment. We've all seen what happens when a committee attempts to be "sensible."

RE