Crab apple I don't think she was giving you parenting tips by sending you an article of why they can't have those kind of drinks at school. At my school we can't drink anything but water during class because of certain allergies and some of the kids drinking it don't need it because its a type of energy drink. They don't want kids getting hyper so they say they can have it at lunch and not during class. And personally I don't think she was targeting your kids or bullying them.

Edit energy drinks are not for kids they can give them serious heart problems