This is bizarre to me. If you disagree with somebody, fine, go have your own rally, but don't interrupt others'.
I would suspect that it's bizarre to you because you believe that we still live in a society in which "freedom of speech" and "freedom of religion" are fundamental concepts. I'm not sure that's true anymore. Yes, this country used to believe that if you disagree with someone, "fine - go have your own rally." But today, we have instead groups like this: http://ffrf.org/
-> The "freedom from religion" group. They don't just believe in their right to believe what they want. They believe they have a "right" to be "free" from your beliefs as well. Check out their website and then step back and think about it for a moment. I mean, really think about it. What exactly does it mean? "Freedom from religion"? What if we were to start a "freedom from atheism" group? What is the foundational belief of a group that starts with "freedom from"? What does it mean to say that one has a right to be free of someone else's beliefs? How exactly does that square with a belief in freedom of speech and freedom of religion?
We used to believe in our right to practice our own beliefs. Apparently now we are a nation in which we believe we not only have a right to believe in our own beliefs, but also have a right to be "free" of another's beliefs.
How is that not a first step on the path to fascism?
I suspect it's just a matter of time until we have a "Freedom from Catholicism" group.
Of course, some believe recent actions from the White House indicate that such a group already exists!