It doesn't matter why the child was not invited -- if a child is not invited then don't do in front of the class. The child could very well have been the one who is unpopular, or mom doesn't get along with his/her mom, or he/she lives in the wrong neighborhood, or it could simply be parents can only afford to have 6 friends at the party. Fill in the blank for reason why a child is not invited. It is the equivilent of handing out candy to everyone but a select few. It boggles the imagination as to how a parent can think that is something that want their child to participate in -- it's ok Sally, bring this candy to school and hand it out in front of the class to just your friends. What in the heck lesson is that teaching them? Why do you always look for PC crap nonsense, when this is just a simple lesson in human kindness and treating others the way in which you would like to be treated.