>> Everytime I see this I keep looking for serious frowns and keep hoping I’ll hear someone stand up and shout, “No! You will not do this!” <<
Two things:
1. Any Catholic with any shred of Orthodoxy would have left that parish long ago. The frog in the pot has been boiled tender. This is not base presumption: one of the blogs noted the democgraphics of the mass attendees, and one can safely infer that this has become (perhaps more damning than your question) essentially a gay parish, with but a small handful of even “gay-allied” heterosexuals.
2. Standing up and shouting, “No! You will not do this!” just simply isn’t something one does during mass, especially when the appellate authority (the archbishop) is the one permitting it. Apparently, the few non-perverts in the congregation resorted to videotaping the archbishop precisely as their way of documenting the abuse for appeal beyond him, and it has proven much more effective than causing a ruckus. I’d suspect the approach of shouting “no!” has been exhausted previously.
>> Do you think it’s because this took place in San Francisco that no one seemed to object? <<
So, yes, my answer is that because this took place in the center of the gay zone of Frisco, few seemed to object
I understand that, and it's a serious thing to interrupt mass. But I keep wondering what it would take for someone to break with decorum, tradition, etc. and take a stand, because this was sacrilege. What's worse, to interrupt mass by saying "No!" or to sit there and let this horror take place?