So, My Son's School Made Him Handle Eggs

So, my son's school had a cooking activity today, and they made him cook with eggs. They did not make him eat it, but they did make him handle eggs. They were making kolaches. They know we are vegan, but I guess we have not made ourselves clear enough. Do I really have to go through this every year with every new set of teachers? Sigh. I just emailed the teachers asking them to let me know ahead of time, and I can send my son in with substitutes for these products. I hope I did not sound like an angry vegan, but I am pretty upset.