I can see all of the sides of this.
Its right to say that it is more green and sustainable to eat a mostly plant based diet and I think we should all be doing that, not just at schools but everywhere.
I also see why parents can be upset about it, nobody wants to have the things that their children can or cannot do dictated to them, including what they eat, parents want to make those decisions themselves.
But the politician who says children can't be healthy without meat is a dinosaur, gets very well paid by the meat farming industry, or both.