The inflammatory title of my post did bleed through the content a bit, didn't it? I just loved the quote. Mea culpa. At some point, indeed, behaviour becomes

The inflammatory title of my post did bleed through the content a bit, didn't it? I just loved the quote. Mea culpa. At some point, indeed, behaviour becomes so bad that you have a moral duty to stand up to it, even if it means burning your bridges on that project. Your examples in these comments fit the bill. But discovering that someone on the project is not a nice person, and someone you wouldn't want to hang out with? Even though they're a Coding Deity? I don't know if I'd work on any large FOSS projects if I drew the line there. Maybe your experience has been more pleasant, or your classification of assholes more sophisticated than mine :)