First, let me say I don’t have a problem with this. I think if schools are going to serve food then they should provide the food that is appropriate for their students.
Having said that, I’m Catholic and I remember brown-bagging because my school didn’t provide meat-free options on Fridays. I live in a largely Catholic area so it certainly would have been a good choice for a large number of the students. Maybe someone from a Jewish area can say what their experience was.
That is different.
Back in the early 70's my Junior High and my High School in Lansing, Michigan always served fish as one of the options.
Times have changed.