You might think that anyone who cares enough to volunteer for an animal rescue group would be, at the very least, reasonably civil to his or her fellow rescuers. However, this seems to be the exception rather than the rule. And some of the higher-profile groups seem to be especially adept at chasing volunteers away.
Two in particular - both blessed by our friends at DAS* - have treated their volunteers so horribly that they actually make jokes about starting a new group comprised entirely of ex-volunteers. For example, I've heard the phrase Feral Friends Rejects mentioned several times, always followed with giggles.
Perhaps one of the most mystifying cat lady harridans out there is in charge of her group's Trap/Neuter/Release efforts. This group occasionally offers free spays and neuters, but anyone who shows up with a trapped stray or feral has to run the gauntlet of the Harridan in Charge. My ex hated to recommend the group to anyone, because no matter how carefully they followed the rules, they risked verbal abuse from the Harridan in Charge upon arrival.