As for the 'she doesnt like me' comment, just my opinion here so i hope i dont offend, but i would be p!ssed off at that one, its a cop out.
Ah my dp pulls this too. I hate it. Some days I just wish I had that option- here you go, pass the baby, someone else take him, I don't want to deal with right now. If only.
But I do try and look at it as my job... just like any job, it sucks sometimes, and I need more time off and i'm too busy to get everything done. That being said, at least dp has a start and finish time. I'm 24/7 on call