The DM do hate Natalie Cassidy.
They hate her because she's just not pretty enough.
They like her more when she loses weight (though they enjoy it more when she puts it back on and also when then they can expose her weight loss as laxative abuse and bulima) and they loved it when she had her breast augmentation a few years back.
It's horrible, because as you say, Aye Robot, Cassidy has courted the DM and similar for years. She appears to really want the kind of status that Kelly Brook or Denise Van Outen have. But she is tolerated and gently patronised (Oh well done Natalie! You've worked hard to make the best of what you've got!) at best.
Poor Natalie - if only she were prettier. It's her nose that's the problem - maybe she should have rhinoplasty? And that wide forehead...would botox do it? Perhaps a better hairstyle would disguise it somehow?
I actually prefer it when the DM are foul about Cassidy; at least it's honest.
I can't see her getting much support from the DM for the attack her fiancé made on her. I suspect that it's seen as natural justice for getting ideas above her station. A plain girl like Nat Cass was punching above her weight with a 'bikini body', a 'hot' boyfriend and a flourishing career with her own tv show and magazine column. The DM are much more comfortable with her being downtrodden and dowdy. After all, everyone knows that it's the prettiest who gets the prizes - what on earth did she think she was doing flouting herself in the papers like that, acting like she was deserving?
Compare her treatment with that of Rhianna, when Chris Brown attacked her. The difference is, Rhianna didn't deserve it because she is pretty.