I hear you on nail cutting. J WILL NOT cut S's nails even when she scratched his face so bad the one day. I was like "Good for you, ass." Try helping out once in a while.
Once, shortly after we split, my ex bailed on his weekend with DS to go out and celebrate his birthday with friends.
I was pissed since DS had also decided to be a nightmare to put to bed. I made him come and put DS to bed in exchange for changing my plans for the weekend.