Why do our gen y kids have that don't worry/be happy attitude when parents are upset daily over finances?

We taught them. To be that way. In many ways that attitude can be healthy. If they have never had to work for anything then they may develop that attitude because parents have always provided everything. We can learn from our children as they tend to live more in the moment and maybe we should not worry about finances so much...After all the most important things in life are not finances but relationships.