I've always thought that saying you're disappointed in someone carried more weight than anger. It's like you're literally fed up with them that you can't even show any hostility
With the addition of my mother forcing me to attend church, I've come to hate Sundays even more. It used to be only because it was the day before Monday.
I don't want to call myself more mature than people my age (because I'm really not), but the number of times I've been disappointed by how said people act is too many to count.