Your original statement was "I don't believe there is any pressure whatsoever." Maybe you meant that in some limited range, but it's hardly nitpicking to think you meant there was no pressure whatsoever.
If your entire point was that you don't have to sing along, sure. I don't think it's even encouraged in many performances. I had a friend who liked to but always did it under his breath to not disrupt things.
I took the original post to be criticizing forced participation in the ritual.