BTGuy:
“It has to be a fictional person, because the remarks about them are disparaging, and that would be loshon hora.”
So? (Are you assuming the mods would not allow lashon hora?)
In any case, Joseph’s true identity is unknown, so I don’t think
it can be considered loshon hora to speak badly about him.
“Plus, I never saw anything posted by any Joseph as nearly annoying as the posts ranting about ‘Joseph’.”
I don’t know about that. I find extreme-right views pretty annoying (especially if there is reason to suspect that they’re not sincere).