You don't/can't. You play following the rules to the best of your ability and let them petition. From my experiences, the GMs are unbiased and will make the decision they feel is fair.
To protect yourself from camp snipers though, /log on, take screenshots with timestamps of you at camp, possibly add some /who to show who is in zone. But if you are at a camp, have been there longer, and are keeping it clear, these threats are likely just threats.
It sucks you've had these bad experiences, hopefully your future interactions are more pleasant.
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