Bagpuss
Legend
You cannot on the one hand say that the rules can't protect you from a bad DM and then also say that the rules can save you from bad players, even if that rule is rule zero. You can't have it both ways.
Yes you can. If the DM is the one with final say established in Rule 0. Because the DM can rule against the bad player to keep them in line, but players can't rule against a bad DM.