I hate to see them angry but at the same time I don't give a sh-t! My s2bx is reaping what she sowed. If her kids hate her - so freakin what IMO.
I know EXACTLY how you feel. Look up some of my posts. My sons (9&14) get discussted with their Mom abandoning them and not helping pay for anything. I can see them starting to dislike her for her actions. She WILL reap what she sows. I agree with you... So freaking what!
BUT... . I try not to focus on her negative actions and instead I try reassure my boys just how much their Dad loves them and I try to make things as stable as I can when they are with me which is most of the time.
Hang in there!