I'm sticking out my neck, here, so be gentle.
I can't count the number of times I've heard RYBs assert, "Judaism is NOT a tolerant religion." It is interesting that the world outside seems to count tolerance as among the so-called Judeo-Christian values.
That said, I think we should manage to have enough empathy to imagine the path that led to this moment and be filled with rachmanus for the holy neshamos involved. Sure, make a clear statement, especially among those of us who are on the edge and need a clear assertion of what we believe. But also, ache inside. And daven for them and everyone involved. (I'm sure those present run the, ahem, rainbow from warped mindsets that truly believe this is the best to being dragged along for fear of alienating them further to being under the thumb of the former two without the gumption to protest.)
On another vein, I know people who have suffered greatly (just like
@Yehudaa apparently does). Sometimes extraordinary tolerance is expected of their parents and acquaintances. Sometimes it may even be chillul of various halachos, lechallel Shabbos achas kidei sheyishmiru... (Which, granted, may not be muttar here.) More often there is no understanding that things will ever return to shimur, but life and death hang in the balance. I'm not the Rav who needed to decide what to say no absolutely to, when to merely make a statement of unacceptability, and when to keep one's mouth firmly shut. I do not know of any cases that went to this extreme and hope I never have to deal with them. But... for example: "When she comes down to breakfast at 12:30PM in her pajamas and eats at the table instead of sleeping the day away and eating like a hermit, that was a nisayon she passed. It may be that her parents never experienced a nisayon that bad in all their lives. And she passed it! If her parents react in any way other than nachas, it is obvious they have no idea what is going on in her head." -RYBs
And one thing is absolutely true - we have no idea what is going on in the heads of anyone at that wedding. So we shouldn't think we do, and judge them. We may have to make a statement but remember that, please.