Hi M.. The same thing happened to me. People asked me if I was invited to a party and I said no, but I was a little puzzled, considering we have known this family for a long time. I actually convinced myself that my son must have lost the invitation when they were passed out at school.
I decided to ask the mom about it and she told me that it was nothing personal.... they are on a budget and she told her son that since he is 5 years old, he can pick 5 people from the class to invite. She ended up apologizing and said we can come to the party too... I felt so dumb. I wish I would of never said anything and not thought twice about it.