My son's high school serves fish every Friday during Lent.
My oldest daughter attended kindergarten at a school which still did celebrate Halloween and Christmas and Thanksgiving, etc. One of her classmates was a Jehovah's Witness, and he sat out every holiday party. There was no fuss...his mother simply came to school and sat with him during the parties.
I believe there are simple ways of solving these problems without fuss.
I would agree with you. However, your statement only works if you're dealing with open minded people eager or willing to arrive at a compromise.
Obviously, that's not the case here. It's their way or no way.