OP I've never crossed paths with you in-game yet but quitting isn't the answer. I've run into my share of people like that and I'll remove them as quickly as they joined. That guy had no right to demand anything unless he intended to solo the fight. Last I checked those trials were a TEAM thing so you were right to say something especially being the leader of the party.

As far as the bullying goes I was not there so can't confirm the truth in your words but if it is true I have no doubts he fabricated info to channel the group's frustration at you. I may not be in your FC but this lala has your back!