I hear ya & yes, it suks but that happens often here especially on political & "social" boards & where egos get involved. My SUGGestion would be to open up another PREMIUM board with a similar topic, put yourself in as MOD & then you can control the membership. Simple.
Stock boards we only allow one board per stock. If you want to join the stock discussion you must use that board. Therefore we don't allow the mods to ban or set special posting rules.
Premium boards can be about most anything. If a user doesn't like a certain Premium board he is free to go start his own premium board. Mods can set the rules and allow or disallow whomever they choose.