I've namechanged as this would identify me quite clearly in RL.
I don't have much time for the lady as she appears in the tabloids, and I agree that she's said things that are at best thoughtless.
However, I have come across her in RL. She lived next door to my elderly grandparents for a while (a few years ago), and the person she was then was miles away from the person that you get in the papers. I only met her once, but they adored her. She took time to get to know them when she moved in, and then started popping in a regular basis for a cup of tea and a chat. Not many people in their early 20s would make that much effort to get to know and spend time with two people in their late 80s. Then she took her Dad round, saying how much he'd like them. She was very good at making my grandparents feel useful and helpful (which they love) without making demands on them. My gran is still talking about the day that Natalie popped in for a cup of tea and had a piece of apple pie. She told my gran she hadn't eaten anything so tasty since her mum had died and could my gran show her how to make it please? Allowing for my gran's tendency to exaggerate, she clearly made a huge effort and they were very sad when she moved out.
So yes, you ABU. Nobody deserves to have the father of their child thump them, however daft the things they may say. I think that fundamentally she's a decent person, just idiotic in the way she says things without thinking first. And even if she were horrid, she wouldn't deserve that.