I recently agreed to help a large group of Mutants and Masterminds players to try to field a game for 25 players, split into five groups of five. They asked me to create a completely original New York City type setting, and I agreed. They even asked me to have it ready by June 7th, so I asked them to create some bare bones skeletons I could use to craft their PCs' friends, love interests, etc when I had enough done to open the signup. This morning I woke up to 35 abusive pms ranging from e simple but effective 'f-bomb you' to being told to lick their [expletive self deleted] from my mom's [expletive self deleted], then one of them even posts in the character signup asking why they should have to even come up with bare-bones info and goes into a rant about how it's my job (despite having to create 8 million+ other NPCs) to create such characters and throws a hissy fit when I posted up why I asked for it. People talk about mutual respect between GMs and players all the time to get respect, yet don't want to give any back. How should I deal with such issues in the future?
